The net resistance of an ammeter should be small to ensure that

1.   it does not get overheated

2.   it does not draw excessive current

3.   it can measure large currents

4.   it does not appreciably change the current to be measured.

Subtopic:  Conversion to Ammeter & Voltmeter |
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The net resistance of a voltmeter should be large to ensure that


1.  it does not get overheated

2.  it does not draw excessive current

3.  it can measure large potential differences

4.  it does not appreciably change the potential difference to be measured

Subtopic:  Conversion to Ammeter & Voltmeter |
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A positively charged particle projected towards east is deflected towards north by a magnetic field. The field may be 

1.  towards west

2.  towards south 

3.  upward

4.  downward

Subtopic:  Lorentz Force |
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A charged particle is whirled in a horizontal circle on a frictionless table by attaching it to a string fixed at one point. If a magnetic field is switched on in the vertical direction, the tension in the string 

1.   will increase

2.   will decrease 

3.   will remain the same

4.   may increase or decrease.

Subtopic:  Lorentz Force |
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Which of the following particles will experience maximum magnetic force (magnitude) when projected with the same velocity perpendicular to a magnetic field?

1.   Electron

2.   Proton

3.   He+

4.   Li++

Subtopic:  Lorentz Force |
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Which of the following particles will describe the smallest circle when projected with the same velocity perpendicular to a magnetic field?

1.   Electron

2.   Proton

3.   He+

4.   Li+

Subtopic:  Lorentz Force |
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Which of the following particles will have minimum frequency of revolution when projected with the same velocity perpendicular to a magnetic field?

1.   Electron

2.   Proton

3.   He+

4.   Li+

Subtopic:  Lorentz Force |
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A circular loop of area 1 cm2, carrying a current of 10 A, is placed in a magnetic field of 0.1 T perpendicular to the plane of the loop. The torque on the loop due to the magnetic field is:
1. zero
2. 10–4 N-m
3. 10–2 N-m
4. 1 N-m

Subtopic:  Current Carrying Loop: Force & Torque |
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A beam consisting of protons and electrons moving at the same speed goes through a thin region in which there is a magnetic field perpendicular to the beam. The protons and the electrons 

1.  will go undeviated

2.  will be deviated by the same angle and will not separate

3.  will be deviated by different angles and hence separate

4.  will be deviated by the same angle but will separate

Subtopic:  Lorentz Force |
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A charged particle moves in a uniform magnetic field. The velocity of the particle at some instant makes an acute angle with the magnetic field. The path of the particle will be

1.  a straight line

2.  a circle

3.  a helix with uniform pitch

4.  a helix with a nonuniform pitch

Subtopic:  Lorentz Force |
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