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

(a) Attract each other with a force of μ0i2/2πd2

(b) Repel each other with a force of μ0i2/2πd2

(c) Attract each other with a force of μ0i2/2πd

(d) Repel each other with a force of μ0i2/2πd

Concept Questions :-

Force between current carrying wires
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Three long, straight parallel wires carrying current, are arranged as shown in figure. The force experienced by a 25 cm length of wire C is

 

(a) 10-3N

(b) 2.5×10-3N

(c) Zero

(d) 1.5×10-3N

Concept Questions :-

Force between current carrying wires
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A 250-turn rectangular coil of length 2.1 cm and width 1.25 cm carries a current of 85μA and subjected to a magnetic field of strength o.85 T. Work done for rotating the coil by 180 against the torque is 

(a) 9.1 μJ

(b) 4.55μJ

(c) 2.3μJ

(d) 1.5μJ

Concept Questions :-

Magnetic moment
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An arrangement of three parallel straight wires placed perpendicular to the plane of paper carrying the same current I along the same direction as shown in the figure. Magnitude of force per unit length on the middle wire B is given by:

1. μoi22πd

2. 2μ0i2πd

3. 2μoi2πd

4. μoi22πd

Concept Questions :-

Magnetic field due to various cases
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A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the center of loop is B. It is then bent into a circular coil of n turns. The magnetic field at the centre of this coil of n turns will be

(a) nB                (b) n2B

(c) 2nB              (d) 2n2B

Concept Questions :-

Magnetic field due to various cases
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An electron is moving in a circular path under the influence of a transverse magnetic field of 3.57×10-2 T. If the value of e/m is 1.76×1011 C/kg, the frequency of revolution of the electron is

(a) 1 GHz              (b) 100 MHz

(c) 62.8 MHz         (d) 6.28 MHz

Concept Questions :-

Lorentz force
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A square loop ABCD carrying a current i, is placed near and coplanar with a long straight conductor XY carrying a current I, the net force on the loop will be:

           

1. μ0Ii2π              2. 2μ0IiL3π

3. μ0IiL2π            4. 2μ0Ii3π

Concept Questions :-

Current carrying loop : Force and torque
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A long straight wire of radius a carries a steady current I. The current is uniformly distributed over its cross-section. The ratio of the magnetic fields B and B' at radial distances a/2 and 2a respectively, from the axis of the wire, is:


1. 1/2

2. 1

3. 4

4. 1/4

Concept Questions :-

Magnetic field due to various cases
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A wire carrying current l has the shape as shown in the adjoining figure. Linear parts of the wire are very long and parallel to X-axis while the semicircular portion of radius R is lying in the Y-Z plane. Magnetic field at point O is :


1. B=μ04π×iRπi^+2k^

2. B=-μ04π×iRπi^-2k^

3. B=-μ04π×iRπi^+2k^

4. B=μ04π×iRπi^-2k^

Concept Questions :-

Magnetic field due to various cases
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An electron moving in a circular orbit of radius r makes n rotations per second. The magnetic field produced at the centre has magnitude:

1. μ0ne2πr2. Zero3. n2er4. μ0ne2r

Concept Questions :-

Lorentz force
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