Explanation:
No current is passed through a conductor means. That the average velocity of a free elecron over a large period of time is zero or the average of the velocity of all the free electrons at an instant is zero.
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The capacitor of capacitance 4 μF and 6 μF are connected in series. A potential difference of 500 volts is applied to the outer plates of the two capacitor system. The potential difference across the plates of capacitor of 4 μF capacitance is
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(a) 500 volts |
(b) 300 volts |
(c) 200 volts |
(d) 250 volts |
Thomson coefficient of a conductor is 10μV/K. The two ends of it are kept at 50℃ and 60℃ respectively. Amount of heat absorbed by the conductor when a charge of 10C flows through it is
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(a) 1000 J |
(b) 100 J |
(c) 100 mJ |
(d) 1 mJ |
The capacity of a parallel plate condenser is C. Its capacity when the separation between the plates is halved will be
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(a) 4 C |
(b) 2C |
(c) |
(d) |
Assertion : The induced emf in a conducting loop of wire will be non zero when it rotates in a uniform magnetic field.
Reason : The emf is induced due to change in magnetic flux.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
The effective capacitance between the points P and Q of the arrangement shown in the figure is
|
(a) |
(b) 1 |
(c) 2 |
(d) 1.33 |
Silver and copper voltameter are connected in parallel with a battery of e.m.f. 12 V. In 30 minutes, 1 gm of silver and 1.8 gm of copper are liberated. The power supplied by the battery is (
and 
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(a) 24.13 J/sec |
(b) 2.413 J/sec |
(c) 0.2413 J/sec |
(d) 2413 J/sec |
The mutual inductance between a primary and secondary circuits is 0.5 H. The resistances of the primary and the secondary circuits are 20 ohms and 5 ohms respectively. To generate a current of 0.4 A in the secondary, current in the primary must be changed at the rate of
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(a) 4.0 A/s |
(b) 16.0 A/s |
(c) 1.6 A/s |
(d) 8.0 A/s |
A mark at the bottom of a liquid appears to rise by 0.1 m. The depth of the liquid is 1 m. The refractive index of the liquid is
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(a) 1.33 |
(b) |
(c) |
(b) 1.5 |
