When two identical capacitors are in series have 3mF capacitance and when parallel 12mF. What is the capacitance of each
|
(a) 6 μF |
(b) 3 μF |
(c) 12 μF |
(d) 9 μF |
(a) 6 μF
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A galaxy is observed to be moving with a velocity of 8600 km-sec–1. If it is at a distance of 430 million light year from us, Hubble constant and corresponding age of the universe are respectively
|
(a) 2 |
(b) 2 |
|
(c) |
(d) None of these |
Consider the charge configuration and spherical Gaussian surface as shown in the figure. When calculating the flux of the electric field over the spherical surface the electric field will be due to
|
(a) |
(b) Only the positive charges |
|
(c) All the charges |
(d) + |
A sphere of radius 1 cm has potential of 8000 V, then energy density near its surface will be
|
(a) 64 |
(b) 8 |
(b) 8 |
(d) 2.83 |
At a place, if the earth's horizontal and vertical components of magnetic fields are equal, then the angle of dip will be
| (a) 30° | (b) 90° | (c) 45° | (d) 0° |
Doping of intrinsic semiconductor is done
|
(a) To neutralize charge carriers |
|
(b) To increase the concentration of majority charge carriers |
|
(c) To make it neutral before disposal |
|
(d) To carry out further purification |
What kind of image is obtained always for concave lens?
