Explanation:
In conductors, charges are equally distributed over the surface of the conductor. Therefore the potential throughout the surface is the same, i.e. equipotential. The electric field is a vector quantity and the field lines cut the equipotential surfaces at 90 degrees. The field lines due to a point charge are radial.
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Resistivity of a semiconductor depends on
|
(a) Shape of semiconductor |
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(b) Atomic nature of semiconductor |
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(c) Length of semiconductor |
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(d) Shape and atomic nature of semiconductor |
With a change of load resistance of a triode, used as an amplifier, from 50 kilo ohms to 100 kilo ohms, its voltage amplification changes from 25 to 30. Plate resistance of the triode is
|
(a) 25 kW |
(b) 75 kW |
(c) 7.5 kW |
(d) 2.5 kW |
Two equal charges q are placed at a distance of 2a and a third charge -2q is placed at the midpoint. The potential energy of the system is
|
(a) |
(b) |
(c) |
(d) |
A current of 10A is passing through a long wire which has semicircular loop of the radius 20cm as shown in the figure. Magnetic field produced at the centre of the loop is
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(a) 10 πμT |
(b) 5 πμT |
(c) 4 πμT |
(d) 2 πμT |
