A 50 volt potential difference is suddenly applied to a coil with 
henry and R = 180 ohm. The rate of increase of current after 0.001 second is
|
(a) 27.3 amp/sec |
(b) 27.8 amp/sec |
(c) 2.73 amp/sec |
(d) None of the above |
(d) None of the above
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In an L–R circuit connected to a battery the rate at which energy is stored in the inductor is plotted against time during the growth of the current in the circuit. Which of the following best represents the resulting curve
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(a)
|
(b)
|
(c)
|
(d)
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Two sources give interference pattern which is observed on a screen, D distance apart from the sources. The fringe width is 2w. If the distance D is now doubled, the fringe width will
|
(a) Become w/2 |
(b) Remain the same |
(c) Become w |
(d) Become 4w |
In hydrogen spectrum the wavelength of 
line is 656 nm whereas in the spectrum of a distant galaxy, line wavelength is 706 nm. Estimated speed of the galaxy with respect to earth is
|
(a) 2 |
(b) 2 |
(c) 2 |
(d) 2 |
A person's near point is 50 cm and his far point is 3 m. Power of the lenses he requires for
(i) reading and (ii) for seeing distant stars are
|
(a) – 2 D and 0.33 D |
(b) 2 D and – 0.33 D |
(c) – 2 D and 3 D |
(d) 2 D and – 3 D |
Two identical induction coils each of inductance L joined in series are placed very close to each other such that the winding direction of one is exactly opposite to that of the other, what is the net inductance
|
(a) L2 |
(b) 2L |
(c) L/2 |
(d) Zero |
