A capacitor is kept connected to the battery and a dielectric slab is inserted between the plates. During this process
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(a) No work is done |
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(b) Work is done at the cost of the energy already stored in the capacitor before the slab is inserted |
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(c) Work is done at the cost of the battery |
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(d) Work is done at the cost of both the capacitor and the battery |
(c) Work is done at the cost of the battery
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The material of wire of potentiometer is
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(a) Copper |
(b) Steel |
(c) Manganin |
(d) Aluminium |
In the following circuit a 10 m long potentiometer wire with resistance 1.2 ohm/m, a resistance R1 and an accumulator of emf 2 V are connected in series. When the emf of thermocouple is 2.4 mV then the deflection in galvanometer is zero. The current supplied by the accumulator will be
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(a) 4 × 10–4 A |
(b) 8 × 10–4 A |
(c) 4 × 10–3 A |
(d) 8 × 10–3 A |
Number of spectral lines in hydrogen atom is
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(a) 3 |
(b) 6 |
(c) 15 |
(d) Infinite |
If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be
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(a) 0.1 watt |
(b) 1 watt |
(c) 10 watt |
(d) 100 watt |