- AEquipotential
- BUnipolar
- CUnipotential
- DBipolar
Explanation:
Electric field at any point is equal to the negative of the potential gradient. But inside a conductor, the electric field is zero. Hence, the electric potential is constant throughout the volume of a conductor and has the same value on its surface. Thus the surface of a conductor is equipotential.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Assertion : The air bubble shines in water.
Reason : Air bubble in water shines due to refraction of light
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
Assertion : A transistor is a voltage-operating device.
Reason : Base current is greater than the collector current.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
For measurement of potential difference, potentiometer is preferred in comparison to voltmeter because
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(a) Potentiometer is more sensitive than voltmeter |
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(b) The resistance of potentiometer is less than voltmeter |
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(c) Potentiometer is cheaper than voltmeter |
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(d) Potentiometer does not take current from the circuit |
In the CB mode of a transistor, when the collector voltage is changed by 0.5 volt. The collector current changes by 0.05 mA. The output resistance will be
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(a) 10 kW |
(b) 20 kW |
(c) 5 kW |
(d) 2.5 kW |
A copper disc of radius 0.1 m is rotated about its centre with 10 revolutions per second in a uniform magnetic field of 0.1 Tesla with its plane perpendicular to the field. The e.m.f. induced across the radius of disc is
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(a) |
(b) |
(c) π |
(d) 2π |
A square of side ‘a’ has charge Q at its centre and charge ‘q’ at one of the corners. The work required to be done in moving the charge ‘q’ from the corner to the diagonally opposite corner is
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(a) Zero |
(b) |
(c) |
(d) |