- AIndirectly proportional
- BDirectly proportional
- CZero
- DConstant
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.
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In an experiment, the saturation in the plate current in a diode is observed at 240V. But a student still wants to increase the plate current. It can be done, if
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(a) The plate voltage is increased further |
|
(b) The plate voltage is decreased |
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(c) The filament current is decreased |
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(d) The filament current is increased |
An electric dipole is kept in non-uniform electric field. It experiences
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(a) A force and a torque |
(b) A force but not a torque |
|
(c) A torque but not a force |
(d) Neither a force nor a torque |
A 4 mF capacitor, a resistance of 2.5 MW is in series with 12 V battery. Find the time after which the potential difference across the capacitor is 3 times the potential difference across the resistor. [Given ln(2)= 0.693]
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(a) 13.86 s |
(b) 6.93 s |
(c) 7 s |
(d) 14 s |
Assertion : Moon is seen as it partly reflects the sun light falling on it
Reason : Moon is a satellite of earth. It does not emit light of its own
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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. |
The possible quantum number for 3d electron are
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(a) n = 3, l = 1, |
(b) n = 3, l = 2, |
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(c) n = 3, l = 1, |
(d) n = 3, l =0, |
The tail of the comet is due to
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(a) Vaporisation of water on the comet |
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(b) Sublimation of vapour in the comet |
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(c) Cooling of water in the comet |
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(d) Vaporisation of heat in the comet |