Rate of work done by electric field at P is zero

Rate of work done by both the fields at Q is zero

JEE Questions for Physics Moving Charges And Magnetism Quiz 11

Two particles each of mass m and charge q are attached to the two ends of a light rod of length 2R. The rod is rotated at constant angular speed about a perpendicular axis passing through its centre. The ratio of the magnitudes of the magnetic moment of the system and its angular momentum about the centre of the rod is

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Two very long, straight and parallel wires carry steady currents I and I respectively. The distance between the wires is d. At a certain instant of time, a point charge q is at a point equidistant from the two wires in the plane of the wires. Its instantaneous velocity v is perpendicular to this plane. The magnitude of the force due to the magnetic field acting on the charge at this instant is

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0

A ring of radius R, made of an insulating material carries a charge Q uniformly distributed on it. If the ring rotates about the axis passing through its centre and normal to plane of the ring with constant angular speed ω, then the magnitude of the magnetic moment of the ring is

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What will be the resultant magnetic field at origin due to four infinite length wires if each wire produces magnetic field \'B\' at origin
Physics-Moving Charges and Magnetism-83139.png

Physics-Moving Charges and Magnetism-83139.png

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a) 4 B
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2)
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Zero

The ratio of the magnetic field at the centre of a current carrying circular wire and the magnetic field at the centre of a square coil made from the same length of wire will be

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Two infinite length wires carry currents 8 A and 6 A respectively and are placed along X and Y–axis. Magnetic field at a point P(0, 0, d)m will be

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Figure shows a square loop ABCD with edge length a. The resistance of the wire ABC is r and that of ADC is 2 r. The value of magnetic field at the centre of the loop assuming uniform wire is
Physics-Moving Charges and Magnetism-83153.png

Physics-Moving Charges and Magnetism-83153.png

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Figure shows the cross-sectional view of the hollow cylindrical conductor with inner radius ‘R’ and outer radius ‘2R’ Cylinder is carrying uniformly distributed current along it’s axis. The magnetic induction at point ‘P’ at a distance 3R/2from the axis of the cylinder will be
Physics-Moving Charges and Magnetism-83159.png

Physics-Moving Charges and Magnetism-83159.png

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Zero
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A long wire AB is placed on a table. Another wire PQ of mass 1.0 g and length 50 cm is set to slide on two rails PS and QR. A current of 50 A is passed through the wires. At what distance above AB, will the wire PQ be in equilibrium
Physics-Moving Charges and Magnetism-83164.png

Physics-Moving Charges and Magnetism-83164.png

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25 mm
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50 mm
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75 mm
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100 mm

An infinitely long straight conductor AB is fixed and a current is passed through it. Another movable straight wire CD of finite length and carrying current is held perpendicular to it and released. Neglect weight of the wire
Physics-Moving Charges and Magnetism-83166.png

Physics-Moving Charges and Magnetism-83166.png

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The rod CD will move upwards parallel to itself
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The rod CD will move downward parallel to itself
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The rod CD will move upward and turn clockwise at the same time
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The rod CD will move upward and turn anti-clockwise at the same time

Physics-Moving Charges and Magnetism-83168.png

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Two thick wires and two thin wires, all of the same materials and same length form a square in the three different ways P, Q and R as shown in the fig. with current connection shown. The magnetic field at the centre of the square is zero in cases
Physics-Moving Charges and Magnetism-83174.png

Physics-Moving Charges and Magnetism-83174.png

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In P only
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In P and Q only
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In Q and R only
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P and R only

Physics-Moving Charges and Magnetism-83176.png

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Same current i = 2A is flowing in a wire frame as shown in figure. The frame is a combination of two equilateral triangles ACD and CDE of side 1 m. It is placed in uniform magnetic field B = 4T acting perpendicular to the plane of frame. The magnitude of magnetic force acting on the frame is
Physics-Moving Charges and Magnetism-83182.png

Physics-Moving Charges and Magnetism-83182.png

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24 N
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Zero
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16 N
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8 N

A uniform conducting wire ABC has a mass of 10 g. A current of 2 A flows through it. The wire is kept in a uniform magnetic field B = 2T. The acceleration of the wire will be
Physics-Moving Charges and Magnetism-83184.png

Physics-Moving Charges and Magnetism-83184.png

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Zero
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12 ms–2 along y–axis
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1.2 × 10–3 ms–2 along y–axis
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0.6 × 10–3 ms–2 along y–axis

In the given figure net magnetic field O will be
Physics-Moving Charges and Magnetism-83186.png

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In the following figure a wire bent in the form of a regular polygon of n sides is inscribed in a circle of radius a. Net magnetic field at centre will be
Physics-Moving Charges and Magnetism-83192.png

Physics-Moving Charges and Magnetism-83192.png

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A long straight wire of radius \'a\' carries a steady current i. The current is uniformly distributed across its cross section. The ratio of the magnetic field at a/2 and 2a is

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1/4
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4
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1
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1/2

A proton accelerated by a potential difference 500 KV moves though a transverse magnetic field of 0.51 T as shown in figure. The angle θ through which the proton deviates form the initial direction of its motion is
Physics-Moving Charges and Magnetism-83198.png

Physics-Moving Charges and Magnetism-83198.png

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15°
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30°
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45°
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60°

AB and CD are long straight conductors, distance d apart, carrying a current I. The magnetic field at the midpoint of BC is
Physics-Moving Charges and Magnetism-83200.png

Physics-Moving Charges and Magnetism-83200.png

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The unit vectors i ̂,j ̂and k ̂are as shown below. What will be the magnetic field at Oin the following figure
Physics-Moving Charges and Magnetism-83206.png

Physics-Moving Charges and Magnetism-83206.png

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Physics-Moving Charges and Magnetism-83212.png

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A circular coil of 5 turns and of 10 cm mean diameter is connected to a voltage source. If the resistance of the coil is 10 Ω, the voltage of the source so as to nullify the horizontal component of earth\'s magnetic field of 30 A turn m^–1 at the centre of the coil should be

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6 V, plane of the coil normal to magnetic meridian
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2 V, plane of the coil normal to magnetic meridian
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6 V, plane of the coil along the magnetic meridian
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2 V, plane of the coil along the magnetic meridian

Which of the following graphs shows the variation of magnetic induction B with distance r from a long wire carrying current

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Two very thin metallic wires placed along X and Y–axis carry equal currents as shown here. AB and CD are lines at 45° with the axes with origin of axes at O. The magnetic field will be zero on the line
Physics-Moving Charges and Magnetism-83223.png

Physics-Moving Charges and Magnetism-83223.png

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AB
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CD
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Segment OB only of line AB
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Segment OC only of line CD

Two long parallel wires are at a distance 2d apart. They carry steady equal current flowing out of the plane of the paper, as shown. The variation of the magnetic field B along the line XX\'is given by

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Two parallel beams of protons and electrons, carrying equal currents are fixed at a separation d. The protons and electrons move in opposite directions. P is a point on a line joining the beams, at a distance x from any one beam. The magnetic field at P is B. If B is plotted against x, which of the following best represents the resulting curve

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A long thin hollow metallic cylinder of radius ‘R’ has a current i ampere. The magnetic induction ‘B’–away from the axis at a distance r from the axis varies as shown in

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The correct curve between the magnetic induction (B) along the axis of a long solenoid due to current flow i in it and distance x form one end is

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A particle of charge q and mass m is moving along the x–axis with a velocity v and enters a region of electric field E and magnetic field B as shown in figure below. For which figure the net force on the charge may be zero

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Physics-Moving Charges and Magnetism-83249.png

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Zero

The (τ –graph for a coil is

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A uniform magnetic field B and a uniform electric field E act in a common region. An electron is entering this region of space. The correct arrangement for it to escape undeviated is

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Physics-Moving Charges and Magnetism-83264.png

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A thin wire of length l is carrying a constant current. The wire is bent to form a circular coil. If radius of the coil, thus formed, is equal to R and number of turns in it is equal to n, then which of the following graphs represent (s) variation of magnetic field induction (B) at centre of the coil

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A current is flowing through a thin cylindrical shell of radius R. If energy density in the medium, due to magnetic field, at a distance r from axis of the shell is equal to U then which of the following graphs is correct

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If current flowing through shell of previous objective is equal to i, then energy density at a point distance 2R from axis of the shell varies according to the graph

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A circular coil is in y–z plane with centre at origin. The coil is carrying a constant current. Assuming direction of magnetic field at x = –25 cm to be positive direction of magnetic field, which of the following graphs shows variation of magnetic field along x–axis

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Graph of force per unit length between two long parallel current carrying conductors and the distance between them is

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Straight line
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Parabola
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Ellipse
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Rectangular hyperbola

Physics-Moving Charges and Magnetism-83289.png

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A charge Q is uniformly distributed over the surface of non–conducting disc of radius R. The disc rotates about an axis perpendicular to its plane and passing through its centre with an angular velocity ω. As a result of this rotation a magnetic field of induction B is obtained at the centre of the disc. If we keep both the amount of charge placed on the disc and its angular velocity to be constant and vary the radius of the disc then the variation of the magnetic induction at the centre of the disc will be represented by the figure

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A particle of mass m and charge q, moving with velocity V enters Region II normal to the boundary as shown in the figure. Region II has a uniform magnetic field B perpendicular to the plane of the paper. The length of the Region II is l. Choose the correct choice (s)
Physics-Moving Charges and Magnetism-83300.png

Physics-Moving Charges and Magnetism-83300.png

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Time spent in Region II is same for any velocity V as long as the particle returns to Region I

Magnetic field intensity at the centre of coil of 50 turns, radius 0.5 m and carrying a current of 2 A is

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0.5 × 10–5 T
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1.25 × 10–4 T
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3 × 10–5 T
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4 × 10–5 T

The magnetic field at a distance r from a long wire carrying current i is 0.4 tesla. The magnetic field at a distance 2r is

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0.2 tesla
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0.8 tesla
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0.1 tesla
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1.6 tesla

An infinite current carrying wire passes through point O and in perpendicular to the plane containing a current carrying loop ABCD as shown in the figure. Choose the correct option(s)
Physics-Moving Charges and Magnetism-83305.png

Physics-Moving Charges and Magnetism-83305.png

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Net force on the loop is zero
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Net torque on the loop is zero
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As seen from O, the loop rotates clockwise
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As seen from O, the loop rotates anti clockwise

H⁺, He⁺ and O⁺⁺ ions having same kinetic energy pass through a region of space filled with uniform magnetic field B directed perpendicular to the velocity of ions. The masses of the ions H⁺, He⁺ and O⁺⁺ are respectively in the ratio 1 : 4 : 16. As a result

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H+ ions will be deflected most
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O++ ions will be deflected least
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He+ and O++ ions will suffer same deflection
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All ions will suffer the same deflection

Physics-Moving Charges and Magnetism-83307.png

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Rate of work done by electric field at P is zero
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Rate of work done by both the fields at Q is zero

Physics-Moving Charges and Magnetism-83311.png

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E = 0, B = 0
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E = 0, B ≠ 0
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E ≠ 0, B = 0
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E ≠ 0,B ≠ 0

The radius of curvature of the path of a charged particle moving in static uniform magnetic field is

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Directly proportional to the magnitude of the charge on the particle
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Directly proportional to the magnitude of the linear momentum of the particle
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Directly proportional to the kinetic energy of the particle
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Inversely proportional to the magnitude of the magnetic field

Two coaxial solenoids 1 and 2 of the same length are set so that one is inside the other. The number of turns per unit length are n₁ and n₂. The currents i₁ and i₂ are flowing in opposite directions. The magnetic field inside the inner coil is zero. This is possible when

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i1 ≠ i2 and n1 = n1
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i1 = i2 and n1 ≠ n1
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i1 = i2 and n1 = n1
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i1n1 = i2n2

JEE Questions for Physics Moving Charges And Magnetism Quiz 11 - MCQExams.com

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JEE Questions for Physics Moving Charges And Magnetism Quiz 11 - MCQExams.com

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