A neutron of mass m enters a uniform magnetic field B with the velocity v perpendicular to it. The radius of the circular path made by a neutron is :

1.  mvB  

2.  mvB2  

3.  Infinity   

4.  Zero

Subtopic:  Lorentz Force |
 56%
From NCERT
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Which of the following graphs correctly represents the variation of magnetic field induction with distance due to a thin wire carrying current?

1.   2.
3. 4.
Subtopic:  Magnetic Field due to various cases |
 80%
From NCERT
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What is the magnetic dipole moment of the given loop?

                    

1. \({ 5 \over 2} \pi R^2I\) 2. \(3 \pi R^2I\)
3. \({ 3 \over 2} \pi R^2I\) 4. \(5 \pi R^2I\)
Subtopic:  Magnetic Moment |
 53%
From NCERT
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A galvanometer of resistance \(240~\Omega\) allows only \(4\%\) of the main current after connecting a shunt resistance. What is the value of shunt resistance?
1. \(10~\Omega\)
2. \(20~\Omega\)
3. \(8~\Omega\)
4. \(5~\Omega\)

Subtopic:  Conversion to Ammeter & Voltmeter |
 75%
From NCERT
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A long solenoid has 800 turns per meter length of the solenoid. A current of 1.6 A flows through it. The magnetic induction at the end of the solenoid on its axis is:

1.  16×10-4 T

2.  8×10-4 T

3.  32×10-4 T

4.  4×10-4 T

Subtopic:  Magnetic Field due to various cases |
 58%
From NCERT
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A galvanometer can be used as a voltmeter by connecting a :

1. High resistance in series

2. Low resistance in series

3. High resistance in parallel

4. Low resistance in parallel

Subtopic:  Conversion to Ammeter & Voltmeter |
 73%
From NCERT
PMT - 1993
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The resistance of an ideal voltmeter is 

1. Zero

2. Very low

3. Very large

4. Infinite

Subtopic:  Conversion to Ammeter & Voltmeter |
 67%
From NCERT
PMT - 1998
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A voltmeter of resistance 1000 Ω gives full-scale deflection when a current of 100 mA flow through it. The shunt resistance required across it to enable it to be used as an ammeter reading 1 A at full-scale deflection is :

1. 10000 Ω

2. 9000 Ω

3. 222 Ω

4. 111 Ω

Subtopic:  Moving Coil Galvanometer |
 70%
From NCERT
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If an ammeter \(A\) reads \(2\) A and the voltmeter \(V\) reads \(20\) V, what is the value of resistance \(R\)? (Assuming finite resistances of ammeter and voltmeter)
            

1. Exactly \(10~\Omega\)
2. Less than \(10~\Omega\)
3. More than \(10~\Omega\)
4. We cannot definitely say
Subtopic:  Conversion to Ammeter & Voltmeter |
From NCERT
PMT - 2004
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A voltmeter has a range 0-V with a series resistance R. With a series resistance 2R, the range is 0-V'. The correct relation between V and V' is :

1. V'=2V

2. V'>2V

3. V'>>2V

4. V'<2V

Subtopic:  Conversion to Ammeter & Voltmeter |
From NCERT
PMT - 2001
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