- AAmpere
- BVolt
- CVolt.m
- DCoulomb
Explanation:
An electric potential (also called the electric field potential or the electrostatic potential) is the amount of electric potential energy that a unitary point electric charge would have if located at any point of space, and is equal to the work done by an electric field in carrying a unit positive charge from infinity to that point.
This value can be calculated in either a static (time-invariant) or a dynamic (varying with time) electric field at a specific time in units of joules per coulomb, or volts (V). The electric potential at infinity is assumed to be zero.
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A hollow metal sphere of radius 5 cm is charged so that the potential on its surface is 10 V. The potential at the centre of the sphere is
|
(a) 0 V |
(b) 10 V |
|
(c) Same as at point 5 cm away from the surface |
(d) Same as at point 25 cm away from the surface |
The valence band and conduction band of a solid overlap at low temperature, the solid may be
|
(a) A metal |
(b) A semiconductor |
(c) An insulator |
(d) None of these |
What is increased in step-down transformer
|
(a) Voltage |
(b) Current |
(c) Power |
(d) Current density |
The angle of minimum deviation measured with a prism is 30° and the angle of prism is 60°. The refractive index of prism material is
|
(a) |
(b) 2 |
(c) 3/2 |
(d) 4/3 |