- A2Q
- B
- C0
- D
Explanation:
Since the total charge on a capacitor is given by sum of the charges on the two parallel plates, here charge on each plate is equal and opposite, hence –Q + Q = 0. Therefore, the total charge on the capacitor is 0.
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The frequency of a light ray is 6 . Its frequency when it propagates in a medium of refractive index 1.5, will be
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(a) 1.67 |
(b) 9.10 |
(c) 6 |
(d) 4 |

The electron mobility in N-type germanium is 3900 cm2/v-s and its conductivity is 6.24 mho/cm, then impurity concentration will be if the effect of cotters is negligible
|
(a) 1015 cm3 |
(b) 1013 /cm3 |
(c) 1012 /cm3 |
(d) 1016 /cm3 |
The PN junction diode is used as
| (a) An amplifier | (b) A rectifier | (c) An oscillator | (d) A modulator |
A copper voltameter is connected in series with a heater coil of resistance 0.1 Ω. A steady current flows in the circuit for twenty minutes and mass of 0.99 g of copper is deposited at the cathode. If electrochemical equivalent of copper is 0.00033 gm/C, then heat generated in the coil is
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(a) 750 J |
(b) 650 J |
(c) 350 J |
(d) 250 J |
An external resistance R is connected to a battery of e.m.f. V and internal resistance r. The joule heat produced in resistor R is maximum when R is equal to
|
(a) r |
(b) |
(c) 2r |
(d) Infinitely large |