The given figure shows a semicircular loop of radius R carrying current I and is placed in a uniform magnetic field B. The force acting on the semicircular part of the loop is

1. B0πlR

2. 2πlRB

3. lRB

4. 2lRB

Subtopic:  Current Carrying Loop: Force & Torque |
 70%
From NCERT
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A non-conducting rod AB of length L has a positive linear charge density λ. This rod is rotated about its one end with an angular speed ω as shown. The magnetic moment associated with this rod is-

1. λL3ω3

2. λL3ω6

3. πL3ω12

4. πL3ω24

Subtopic:  Magnetic Moment |
 59%
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 A charge is moving in a circular path of radius 'r' with speed v in a transverse magnetic field B. Specific charge of the particle is

1. vBr

2. Bvr

3. Bvr

4. vrB

Subtopic:  Cyclotron (OLD NCERT) |
 75%
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Voltage sensitivity of a moving coil galvanometer is Vs and current sensitivity is Is. Resistance of galvanometer is 'G'. The relation between Vs and Isis :

1. Vs=lsG

2. Vs=ls.G

3. GVsIs=Vs

4.  GVs=Is

Subtopic:  Moving Coil Galvanometer |
 71%
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A straight current-carrying wire is placed along the axis of a current-carrying loop, then force between them is

1. Repulsive 

2. Attractive 

3. Zero

4. Cannot be predicted

Subtopic:  Force between Current Carrying Wires |
 60%
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An α-particle completes 40,000 revolutions in a cyclotron before exiting from it. If potential difference between the Dees is 5000 V, then the energy gained by the particle is

1. 8 MeV

2. 800 MeV

3. 4 MeV

4. 400 MeV 

Subtopic:  Cyclotron (OLD NCERT) |
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Two wires of large length carry equal currents each i. One wire is kept along x-axis and the other is kept along y-axis. The magnitude of magnetic field at a point on z-axis at distance d from the origin is

1. μ0i2πd

2. μ0i2πd

3. μ0iπd

4. zero

Subtopic:  Biot-Savart Law |
 57%
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To compensate the relativistic variation of mass at high speed of charge in cyclotron. Adjustments can be made is :

1. Frequency of a.c is decreased 

2. Magnetic field is increased 

3. Peak value of a.c is increased 

4. Both (1) & (2)

Subtopic:  Cyclotron (OLD NCERT) |
 71%
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A infinite straight wire carrying current 3 A and other carrying 6 A in the same direction produce a magnetic field of 12 tesla at the midpoint of the line joining them. When 6-ampere current wire is switched off, the magnetic field will be :

                                        

1. 24 T

2. 3 T

3. 6 T

4. 12 T

Subtopic:  Force between Current Carrying Wires |
 58%
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The magnetic field at origin in the situation shown in the figure has magnitude (BCD is a semi-circular arc of radius R in xz plane) 

                          

1. μ0l4πR

2. μ0l2πR4+π2

3. μ0l2πRR2+π2

4. μ0l4πR1+π2

Subtopic:  Magnetic Field due to various cases |
 62%
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