Two capacitors C1 and C2 = 2C1 are connected in a circuit with a switch between them as shown in the figure. Initially the switch is open and C1 holds charge Q. The switch is closed. At steady state, the charge on each capacitor will be
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(a) Q, 2Q |
(b) Q/3, 2Q/3 |
(c) 3Q/2, 3Q |
(d) 2Q/3, 4Q/3 |
(b) Q/3, 2Q/3
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A positively charged thin metal ring of radius R is fixed in the xy - plane with its centre at the O. A negatively charged particle P is released from rest at the point (0, 0, 
where 
. Then the motion of P is
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(a) Periodic for all values of |
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(b) Simple harmonic for all values of satisfying 0 < |
|
(c) Approximately simple harmonic provided |
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(d) a, c |
The electric field E, current density J and conductivity s of a conductor are related as
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(a) σ = E/j |
(b) σ = j/E |
(c) σ = jE |
(d) σ = 1/jE |
If a high power heater is connected to electric mains, then the bulbs in the house become dim, because there is a
|
(a) Current drop |
(b) Potential drop |
(c) No current drop |
(d) No potential drop |
The photo-electrons emitted from a surface of sodium metal are such that
|
(a) They all are of the same frequency |
|
(b) They have the same kinetic energy |
|
(c) They have the same de Broglie wavelength |
|
(d) They have their speeds varying from zero to a certain maximum |
