JEE Questions for Physics Moving Charges And Magnetism Quiz 5 - MCQExams.com

Two thin, long, parallel wires, separated by a distance d carry a current of i ampere in the same direction. They will

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  • 2)
    Physics-Moving Charges and Magnetism-82529.png

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A circular coil of 20 turns and radius 10 cm is placed in uniform magnetic field of 0.10 T normal to the plane of the coil. If the current in coil is 5 A, then the torque acting on the coil will be
  • 31.4 N–m
  • 3.14 N–m
  • 0.314 N–m
  • zero
A vertical straight conductor carries a current vertically upwards. A point P lies to the east of it at a small distance and another point Q lies to the west at the same distance. The magnetic field at P is
  • greater than at Q
  • same as at Q
  • less than at Q
  • greater or less than at, Q depending upon the strength of current.
In the fig. shown the magnetic field induction at the centre O of the arc due to current in portion CD will be
Physics-Moving Charges and Magnetism-82535.png
  • μ0I
  • μ0I/2r
  • μ0I/4r
  • zero
In the fig. shown, there are two semicircles of radii r1 and r2 in which a current I is flowing. The magnetic field induction at the centre O will be
Physics-Moving Charges and Magnetism-82536.png

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  • 2)
    Physics-Moving Charges and Magnetism-82538.png

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A current I flows along the length of an infinity long straight thin walled pipe. Then
  • the magnetic field at all points inside the pipe is same but not zero
  • the magnetic field at any point inside the pipe is zero
  • the magnetic field is zero only on the axis of the pipe
  • the magnetic field is different at different point inside the pipe.
A straight conductor carrying a direct current i amp. is split into circular loop as shown in Fig. Then the magnetic induction at the centre of the circular loop of radius r meter is
Physics-Moving Charges and Magnetism-82543.png
  • 0
  • ∞

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An infinite long straight conductor is bent into the shape as shown in the fig. It carries a current of I ampere and the radius of the circular loop is r metre. Then the magnetic induction at its centre will be
Physics-Moving Charges and Magnetism-82546.png
  • Zero
  • Infinite

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  • Physics-Moving Charges and Magnetism-82548.png
Equal current I flows in two segments of a circular loop in the direction shown in Fig. Radius of the loop is r. The magnitude of magnetic field induction at the centre of the loop is
Physics-Moving Charges and Magnetism-82550.png
  • zero
  • 2)
    Physics-Moving Charges and Magnetism-82551.png

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  • Physics-Moving Charges and Magnetism-82553.png
There is a magnetic field acting in a plane downward perpendicular to sheet of paper. Particles in vacuum move in the plane of paper from left to right.The path indicated by a particle could be traveled by
Physics-Moving Charges and Magnetism-82555.png
  • proton
  • neutron
  • electron
  • α particle
The electric field in the space between the plates of a discharge tube is 3.25 × 104 newtons/coulomb. If the mass of a proton is 1.67 × 10-27 kg and its charge is 1.60 × 10-19 coulomb, the force of the electric field on a proton in this field is
  • 10.40 × 10-15 newtons
  • 10.40 × 10-16 newtons
  • 2.0 × 10-16 newtons
  • 5.20 × 10-15 newtons.

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  • 2)
    Physics-Moving Charges and Magnetism-82559.png
  • it always possesses circular motion
  • it can go undeflected also
A loosely wound helix made of stiff wire is mounted vertically with the lower end just touching a dish of mercury. When a current from a battery is started in the coil through the mercury
  • the wire oscillates
  • the wire continues making contact
  • the wire breaks contact just as current is passed
  • The mercury will expand by heating due to passage of current.
A current I1 carrying wire AB is placed near an another long wire CD carrying current I2. Fig If free to move, wire AB will have
Physics-Moving Charges and Magnetism-82560.png
  • rotational motion only
  • translational motion only
  • rotational as well as translational motion
  • neither rotational nor translational motion
A candidate connects a moving coil ammeter A and a moving coil voltmeter V and a resistance R as shown in Fig.If the voltmeter reads 20 volt and the ammeter reads 4 ampere, then R is
Physics-Moving Charges and Magnetism-82562.png
  • equal to 5 ohms
  • greater than 5 ohms
  • less than 5 ohms
  • greater or less than 5 ohms depending upon its material.
The coil of a sensitive moving coil galvanometer swings uncontrollably. This movement can be stopped rapidly by
  • connecting a large resistance across the ends of the coil
  • holding a magnet near to the coil
  • connecting a short length of copper wire across the ends of the coil
  • earthing the case of the instrument
A wire oriented in the east-west direction carries a current eastward. Direction of the magnetic field at a point to the south of wire is
  • Vertically down
  • Vertically up
  • North-east
  • South-east
In the given diagram two long parallel wires carry equal currents in opposite directions. Point O is situated midway between the wires and the XY – plane contains the two wires and the positive Z – axis comes normally out of the plane of paper. The magnetic field B at O is non – zero along
Physics-Moving Charges and Magnetism-82563.png
  • XY and Z axis
  • X – axis
  • Y – axis
  • Z – axis
A rectangular loop carrying a current I is situated near a long straight wire such that the wire is parallel to the one of the sides of the loop and is in the plane of the loop. If a steady current I is established in wire as shown in fig. the loop will
Physics-Moving Charges and Magnetism-82564.png
  • move away from the wire or towards right
  • rotate about an axis parallel to the wire
  • move towards the wire
  • remain stationary
Two particles X and Y having equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describes circular path of radius R1 and R2 respectively. The ratio of mass of X to that of Y is
  • (R1/R2)1/2
  • R2/R1
  • (R1/R2)2
  • R1/R2
Two insulated rings, one of slightly smaller diameter than the other are suspended along their common diameter as shown. Initially the planes of the rings are mutually perpendicular. When a steady current is set up in each of them,
Physics-Moving Charges and Magnetism-82566.png
  • the two rings rotate into a common plane
  • the inner ring oscillates about its initial position
  • the inner ring stays stationary while the outer one moves into the plane of the inner ring.
  • The outer ring stays stationary while the inner one moves into the plane of the outer ring.
A battery is connected between two points A and B on the circumference of a uniform conducting ring of radius r and resistance R. One of the arcs AB of the ring subtends an angle θ at the centre. The value of the magnetic induction at the centre due to the current in the ring is
  • proportional to 2 ( 180o – θ)
  • inversely proportional to r
  • zero, only if θ =180o
  • zero for all vales of θ
A particle is moving in a uniform magnetic field then
  • its momentum changes but total energy remains the same
  • both momentum and total energy remains the same
  • both change
  • total energy changes but the momentum remains the same
Two long parallel wires P and Q are held perpendicular to the plane of paper with distance of 5m between them. If P and Q carry current of 2.5 amp. And 5 amp. Respectively in the same direction, then the magnetic field at a point half – way between the wires is
  • μ0/17
  • 2)
    Physics-Moving Charges and Magnetism-82567.png
  • μ0/2π
  • 3μ0/2π
A cell is connected between the points A and C of a Circular conductor ABCD of centre O. ∠AOC = 60o. If B1 and B2 are the magnitudes of the magnetic fields at O due to currents in ABC and ADC respectively, the ratio B1/ B2, is
Physics-Moving Charges and Magnetism-82569.png
  • 6
  • 5
  • 1
  • 1/5
An infinitely long conductor PQR is bent to form a right angle as shown in fig. A current I flows through PQR. The magnetic field due to this current at the point M is H1. Now another infinitly long straight conductor QS is connected at Q so that the current in I/2 in QR as well as in QS, the current in PQ remaining unchanged. The magnetic field at M is now H2. The ratio H1/H2 is given by
  • 1/2
  • 1
  • 2/3
  • 2
A particle of mass m and charge q moves with a constant velocity v along the positive x – direction. It enters a region containing a uniform magnetic field B directed along the negative z – direction, extending from x = a to x = b. the minimum value of v required so that the particle can just enter the region x > b is

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  • 2)
    Physics-Moving Charges and Magnetism-82572.png

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Two long straight wires are set parallel to each other. Each carries a current I in the same direction and the separation between them is 2r. The intensity of magnetic field at a point P midway between them is
Physics-Moving Charges and Magnetism-82576.png

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  • 2)
    Physics-Moving Charges and Magnetism-82578.png
  • zero

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A wire carrying current I is shaped as shown in Fig. Section AB is quarter circle of radius r. the magnetic field is directed
Physics-Moving Charges and Magnetism-82581.png
  • along the bisector of the angle ACB away from AB
  • along the bisector of the angle ACB towards AB
  • perpendicular to the plane of paper and directed into the paper
  • at an angle π/4 to the plane of paper.
Two long straight wires are set parallel to each other. Each carries a current I in the same direction and separation between them is 2r. magnitude of magnetic field midway between them is
  • μ0I/r
  • zero
  • 4μ0I/r
  • μ0I/4r
Fig shows a conducting loop ADCA carrying current I and placed in a region of uniform magnetic field induction B0. the part ADC forms a semicircle of radius R. The force on the semicircle part of the loop ADC is equal to
Physics-Moving Charges and Magnetism-82582.png
  • zero
  • πRIB0
  • 2 π RIB0
  • 2RI B0
A current carrying circular loop is placed in x – y plane fig. Magnetic field is switched in z – direction. The loop will
Physics-Moving Charges and Magnetism-82583.png
  • move towards + x
  • move towards – x
  • contracts
  • expands
Electron, portion and α – particle are released perpendicular to a magnetic field with same kinetic energy. Then the radius of curvature of the circular path of
  • electron is maximum
  • α – particle is maximum
  • proton is maximum
  • proton and α-particle are same

Physics-Moving Charges and Magnetism-82585.png
  • along ox
  • opposite to oy
  • along oy
  • opposite to ox

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  • 2)
    Physics-Moving Charges and Magnetism-82589.png

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Three long straight parallel wires carrying currents, are arranged as shown in fig. The force experienced by a 25 cm length of wire C is
Physics-Moving Charges and Magnetism-82593.png
  • 10-3N
  • 2.5 × 10-3N
  • zero
  • 1.5 × 10-3N
Electron of mass m and charge q is traveling with a speed of v along a circular path of radius r at right angles to a uniform magnetic field of intensity B. the speed of the electron is doubled and the magnetic field is halved, the resulting path would have a radius
  • 2 r
  • 4r
  • r/4
  • r/2
An electron whose e/m is 1.76 × 1011C/kg enter a region where there is a uniform magnetic field of induction 2 × 10-3 tesla with a velocity of 3 × 106 m/sec in a direction making an angle of 45o with the field. The pitch of its helical path in the region is
Physics-Moving Charges and Magnetism-82596.png
  • 1.2 cm
  • 3.8 cm
  • 5.36 cm
  • 8.4 cm
A candidate connects a moving coil voltmeter V and moving coil ammeter A and resistor R as shown in Fig ?
Physics-Moving Charges and Magnetism-82598.png
  • equal to 5 ohm
  • greater than 5 ohm
  • less than 5 ohm
  • greater or less than 5 ohms depending upon its material.
The magnetic field at the centre of a loop of a circular wire of radius r carrying current I may be taken as B0 .If a particle of charge q moving with speed v passes the centre of semicircular wire, as shown in Fig. along the axis of the wire, the force on it due to the current is
Physics-Moving Charges and Magnetism-82599.png
  • zero
  • 2)
    Physics-Moving Charges and Magnetism-82600.png

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Three infinitely long conductors A, B and C carrying currents as shown in the fig. the position of the point lying on the straight line AC where the magnetic field is zero is between
Physics-Moving Charges and Magnetism-82604.png
  • A and B at a distance 3.2 cm from B
  • B and C at a distance 3.2 cm from A
  • A and B at a distance of 1.8 cm from B
  • B and C at a distance of 1.8 cm from B
What is the magnetic field induction at the centre O of the arc in the Fig.?
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  • 2)
    Physics-Moving Charges and Magnetism-82608.png

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A conductor AB of length L carrying a current I2, is placed perpendicular to a long straight conductor XY carrying current I1, as shown in Fig. the force on AB is magnitude is
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  • 2)
    Physics-Moving Charges and Magnetism-82614.png

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A charge +q is moving along positive x – direction From origin it follows trajectory (non circular) as shown in Fig. The electric and magnetic fields existing in the region to the right of y – axis may be
Physics-Moving Charges and Magnetism-82618.png

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  • 2)
    Physics-Moving Charges and Magnetism-82620.png

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A length L of wire carries a steady current I. It is bent first to form a circular plane coil of one turn. The same length is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre caused by the same current is
  • A quarter of its first value
  • Unaltered
  • Four times of its first value
  • A half of its first value
If a copper rod carries a direct current, the magnetic field associated with the current will be
  • Only inside the rod
  • Only outside the rod
  • Both inside and outside the rod
  • Neither inside nor outside the rod

Physics-Moving Charges and Magnetism-82624.png
  • 8
  • 3
  • 7
  • None of these
An infinitely long straight conductor is bent into the shape as shown in the figure. It carries a current of i ampere and the radius of the circular loop is r metre. Then the magnetic induction at its centre will be
Physics-Moving Charges and Magnetism-82626.png

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  • 2)
    Physics-Moving Charges and Magnetism-82628.png
  • Zero
  • Infinite
A current i ampere flows in a circular arc of wire whose radius is R, which subtends an angle 3π /2 radian at its centre. The magnetic induction B at the centre is
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  • 2)
    Physics-Moving Charges and Magnetism-82632.png

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  • Physics-Moving Charges and Magnetism-82634.png
A horizontal overhead power line is at a height of 4m from the ground and carries a current of 100A from east to west. The magnetic field directly below it on the ground is (μ0 = 4π × 10–7 TmA–1)
  • 5 × 10–6 T Northward
  • 5 × 10–6 T Southward
  • 2.5 × 10–7 T Northward
  • 2.5 × 10–7 T Southward
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