Current i is carried in a wire of length L. If the wire is turned into a circular coil, the maximum magnitude of torque in a given magnetic field B will be:

1. LiB22                     2. Li2B2

3. L2iB4π                     4. Li2B4π

Subtopic:  Current Carrying Loop: Force & Torque |
 77%
From NCERT
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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

 

(1) 10-3N

(2) 2.5×10-3N

(3) Zero

(4) 1.5×10-3N

Subtopic:  Force between Current Carrying Wires |
 78%
From NCERT
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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

Subtopic:  Force between Current Carrying Wires |
 62%
From NCERT
NEET - 2017
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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

1.  nB               
2.  n2B
3.  2nB             
4. 2n2B

Subtopic:  Magnetic Field due to various cases |
 80%
From NCERT
NEET - 2016
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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

(1) 1 GHz             

(2) 100 MHz

(3) 62.8 MHz         

(4) 6.28 MHz

Subtopic:  Lorentz Force |
 64%
From NCERT
NEET - 2016
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A long solenoid has 1000 turns. When a current of 4.0 A flows through it, the magnetic flux linked with each turn of the solenoid is 4×10-3 Wb. The self-inductance of the solenoid is-

(a) 3H

(b) 2H

(c) 1H

(d) 4H

Subtopic:  Self - Inductance |
 82%
NEET - 2016
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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

Subtopic:  Current Carrying Loop: Force & Torque |
 56%
From NCERT
NEET - 2016
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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 \(\frac{a}{2}\) and \(2a\) respectively, from the axis of the wire, is:
1. \(\frac{1}{2}\) 2. \(1\)
3. \(4\) 4. \(\frac{1}{4}\)
Subtopic:  Ampere Circuital Law |
 58%
From NCERT
NEET - 2016
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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^

Subtopic:  Magnetic Field due to various cases |
 62%
NEET - 2015
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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. μ0ne2πr
2. Zero
3. n2er
4. μ0ne2r

Subtopic:  Magnetic Field due to various cases | Lorentz Force |
 63%
From NCERT
NEET - 2015
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