An electron enters into a region of uniform magnetic field of strength 10 webers/m 2 with a speed of 3 × 10 7 m/s which of the following is not possible

The electron may experience an acceleration and continue to move with same velocity

The electron may or may not experience an acceleration

The electron may experience an acceleration but can continue to move with same speed

The kinetic energy of the electron remains unchanged

JEE Questions for Physics Moving Charges And Magnetism Quiz 15

A current carrying loop is placed in a uniform magnetic field in four different orientations. Fig Arrange them in the decreasing order of potential energy
Physics-Moving Charges and Magnetism-83679.png

Physics-Moving Charges and Magnetism-83679.png

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4,2,3,1
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1,4,2,3
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4,3,2,1
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1,2,3,4

An infinitely long straight conductor is bent into the shape as shown in Fig. it carries a current I ampere and radius of the circular loop is a metre. The magnetic field at the centre of the loop is
Physics-Moving Charges and Magnetism-83681.png

Physics-Moving Charges and Magnetism-83681.png

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0%
2)
0%
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none of these

The magnetic field B at the center of a circular coil of radius r is π times that due to a long straight wire at a distance r from it, for equal currents. Figure here shows three cases: in all cases the circular part has radius r and straight ones are infinitely long. For same current the magnetic field B at the centre P in cases I, II, III have the ratio
Physics-Moving Charges and Magnetism-83686.png

Physics-Moving Charges and Magnetism-83686.png

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0%
2)
0%
0%

Physics-Moving Charges and Magnetism-83692.png

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0%
2)
0%
1
0%
2/3

An equilateral triangle of side length l is formed from a piece of wire of uniform resistance. The current I is fed as shown in the fig. The magnitude of the magnetic field at its centre O is
Physics-Moving Charges and Magnetism-83696.png

Physics-Moving Charges and Magnetism-83696.png

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0%
2)
0%
0%
zero

A long straight wire carrying current I is bent into the shape as shown in the Fig. The circular portion of the wire has radius 10/π m. The centre of this circle is at a distance 1 m from the straight portion of the wire. The magnetic field at the centre O of the circular portion will be equal to (π² =
Physics-Moving Charges and Magnetism-83701.png

Physics-Moving Charges and Magnetism-83701.png

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0%
2)
0%
0%
zero

A square loop ABCD, carrying a current I₂, is placed near and coplanar with a long straight conductor XY carrying a current I₁, as shown in the Fig. The net force on the loop will be
Physics-Moving Charges and Magnetism-83706.png

Physics-Moving Charges and Magnetism-83706.png

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0%
2)
0%
0%

Physics-Moving Charges and Magnetism-83712.png

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0%
2)
0%
0%

A long, straight wire is turned into a loop of radius 10cm (see figure). If a current of 8 amperes is passed through the loop, then the value of the magnetic field and its direction at the centre C of the loop shall be close to
Physics-Moving Charges and Magnetism-83718.png

Physics-Moving Charges and Magnetism-83718.png

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5.0 × 10–5 Newton/(amp-meter), upward
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3.4 × 10–5 Newton/(amp-meter), upward
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1.6 × 10–5 Newton/(amp-meter), downward
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1.6 × 10–5 Newton/(amp-meter), upward

The magnetic induction due to an infinitely long straight wire carrying a current i at a distance r from wire is given by

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0%
2)
0%
0%

In the figure, what is the magnetic field at the point O
Physics-Moving Charges and Magnetism-83724.png

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0%
2)
0%
0%

Two long parallel wires P and Q are both perpendicular to the plane of the paper with distance 5 m 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

0%
0%
2)
0%
0%
0%

A current loop consists of two identical semicircular parts each of radius R, one lying in the x–y plane and the other in x–z plane. If the current in the loop is i. The resultant magnetic field due to the two semicircular parts at their common centre is

0%
0%
2)
0%
0%

Magnetic field induction at the centre O of a square loop of side \'a\' carrying current I as shown in figure is
Physics-Moving Charges and Magnetism-83741.png

Physics-Moving Charges and Magnetism-83741.png

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0%
2)
0%
0%
0%
Zero

Physics-Moving Charges and Magnetism-83746.png

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1 and 3
0%
3 and 4
0%
2 and 3
0%
2 and 4

An electron and a proton with equal momentum enter perpendicularly into a uniform magnetic field, then

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The path of proton shall be more curved than that of electron
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The path of proton shall be loss curved than that of electron
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Both are equally curved
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Path of both will be straight line

Maximum kinetic energy of the positive ion in the cyclotron is

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0%
2)
0%
0%

Two ions having masses in the ratio 1 : 1 and charges 1: 2 are projected into uniform magnetic field perpendicular to the field with speeds in the ratio 2 : 3. The ratio of the radii of circular paths along which the two particles move is

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4 : 3
0%
2 : 3
0%
3 : 1
0%
1 : 4

An electron is travelling along the x-direction. It encounters a magnetic field in the y-direction. Its subsequent motion will be

0%
Straight line along the x-direction
0%
A circle in the xz-plane
0%
A circle in the yz-plane
0%
A circle in the xy-plane

An electron enters into a region of uniform magnetic field of strength 10 webers/m² with a speed of 3 × 10⁷ m/s which of the following is not possible

0%
The electron may or may not experience an acceleration
0%
The electron may experience an acceleration but can continue to move with same speed
0%
The electron may experience an acceleration and continue to move with same velocity
0%
The kinetic energy of the electron remains unchanged

Physics-Moving Charges and Magnetism-83755.png

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0%
2)
0%
0%

Under the influence of a uniform magnetic field a charged particle is moving in a circle of radius R with constant speed V. The time period of the motion

0%
Depends on V and not on R
0%
Depends on both R and V
0%
Is independent of both R and V
0%
Depends on R and not on V

An alternating electric field, of frequency v, is applied across the dees (radius = R) of a cyclotron that is being used to accelerate protons (mass = m). The operating magnetic field (B) used in the cyclotron and the kinetic energy (K) of the proton beam, produced by it, are given by

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0%
2)
0%
0%

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 figure, the loop will
Physics-Moving Charges and Magnetism-83766.png

Physics-Moving Charges and Magnetism-83766.png

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Rotate about an axis parallel to the wire
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Move away from the wire or towards right
0%
Move towards the wire
0%
Remain stationary

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

0%
31.4 Nm
0%
3.14 Nm
0%
0.314 Nm
0%
Zero

A 100 turns coil shown in figure carries a current of 2 amp in a magnetic field B = 0.2 Wb/m². The torque acting on the coil is
Physics-Moving Charges and Magnetism-83769.png

Physics-Moving Charges and Magnetism-83769.png

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32 Nm tending to rotate the side AD out of the page
0%
0.32 Nm tending to rotate the side AD into the page
0%
0.0032 Nm tending to rotate the side AD out of the page
0%
0.0032 Nm tending to rotate the side AD into the page

Physics-Moving Charges and Magnetism-83771.png

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0%
2)
0%
0%

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

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Attract each other with a force of
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Repel each other with a force of
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Attract each other with a force of
0%
Repel each other with a force of

The relation between voltage sensitivity (σ_V) and current sensitivity (σ_i) of a moving coil galvanometer is (Resistance of galvanometer = G)

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0%
2)
0%
0%

Three long straight wires A, B and C are carrying current as shown in the figure. Then the resultant force on B is directed
Physics-Moving Charges and Magnetism-83786.png

Physics-Moving Charges and Magnetism-83786.png

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Towards A
0%
Towards C
0%
Perpendicular to the plane of paper and outward
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Perpendicular to the plane of paper and inward

A closely wound solenoid of 2000 turns and area of cross-section 1.5 × 10^–4 m² carries a current of 2.0 A. It is suspended through its centre and perpendicular to its length, allowing it to turn in a horizontal plane in a uniform magnetic field 5 × 10^–2 tesla making an angle of 30° with the axis of the solenoid. The torque on the solenoid will be

0%
1.5 × 10–2 N.m
0%
3 × 10–2 N.m
0%
3 × 10–3 N.m
0%
1.5 × 10–3 N.m

Physics-Moving Charges and Magnetism-83788.png

0%
0%
2)
0%
0%

JEE Questions for Physics Moving Charges And Magnetism Quiz 15 - MCQExams.com

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JEE Questions for Physics Moving Charges And Magnetism Quiz 15 - MCQExams.com

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