- Araises the potential barrier
- Breduces the majority carrier to zero
- ✓lowers the potential barrier
- Dpotential barrier remain same
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Two long parallel wires carrying equal current separated by 1m, exert a force of 2 on one another. The current flowing through them is
|
(a) 2.0 A |
(b) 2.0 |
(c) 1.0 A |
(d) 1.0 |
A thin metal plate P is inserted half way between the plates of a parallel plate capacitor of capacitance C in such a way that it is parallel to the two plates. The capacitance now becomes
|
(a) C |
(b) C/2 |
(c) 4C |
(d) None of these |
The variation of induced emf (E) with time (t) in a coil if a short bar magnet is moved along its axis with a constant velocity is best represented as

(a)
|
(b)
|
(c)
|
(d)
|
An electric fan and a heater are marked as 100 watt, 220 volt and 1000 watt, 220 volt respectively. The resistance of the heater is
|
(a) Zero |
(b) Greater than that of the fan |
|
(c) Less than that of the fan |
(d) Equal to that of the fan |