- AIncreases
- BDecreases
- CRemains constant
- DBecomes zero
Explanation:
As the battery remains connected across the capacitor, so the potential difference remains constant at V0 even after the introduction of the dielectric slab. In this way, dielectric has an effect on potential difference.
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Consider the following two statements A and B and identify the correct choice given in the answers
(A) Duddells thermo-galvanometer is suitable to measure direct current only
(B) Thermopile can measure temperature differences of the order of ![]()
|
(a) Both A and B are true |
(b) Both A and B are false |
|
(c) A is true but B is false |
(d) A is false but B is true |
The equivalent capacitance between A and B in the figure is 1 μF. Then the value of capacitance C is
|
(a) 1.4 μF |
(b) 2.5 μF |
(c) 3.5 μF |
(d) 1.2 μF |
In a good conductor the energy gap between the conduction band and the valence band is
|
(a) Infinite |
(b) Wide |
(c) Narrow |
(d) Zero |

A power transformer is used to step up an alternating e.m.f. of 220 V to 11 kV to transmit 4.4 kW of power. If the primary coil has 1000 turns, what is the current rating of the secondary ? Assume 100% efficiency for the transformer
|
(a) 4 A |
(b) 0.4 A |
(c) 0.04 A |
(d) 0.2 A |