- AOnly point charge.
- BFor both point charge and distributed charge.
- COnly distributed charges.
- DNeither distributed nor point charge.
Explanation:
Coulomb’s Law explains the force between two point charges only. A distributed charge can be considered as the sum of infinite point charges and thus the force between two distributed charge systems can be explained.
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The unit of electric permittivity is
|
(a) Volt/m2 |
(b) Joule/coulomb |
(c) Farad/m |
(d) Henry/m |
The number of turns in the coil of an ac generator is 5000 and the area of the coil is
. The coil is rotated at the rate of 100 cycles/sec in a magnetic field of 0.2
. The peak value of the emf generated is nearly
|
(a) 786 kV |
(b) 440 kV |
(c) 220 kV |
(d) 157.1 kV |

The plate current ip in a triode valve is given where ip is in milliampere and Vp and Vg are in volt. If rp = 104 ohm, and
, then for
and
, what is the value of K and grid cut off voltage
|
(a) – 6V, (30)3/2 |
(b) -6 V, |
(c) + 6V, (30)3/2 |
(d) + 6V, (1/30)3/2 |
The sun makes 0.5o angle on earth surface. Its image is made by convex lens of 50 cm focal length. The diameter of the image will be
|
(a) 5 mm |
(b) 4.36 mm |
(c) 7 mm |
(d) None of these |
In the figure, shown the magnetic induction at the centre of there arc due to the current in portion AB will be

|
(a) |
(b) |
(c) |
(d) Zero |