In P-N junction, avalanche current flows in circuit when biasing is
| (a) Forward | (b) Reverse | (c) Zero | (d) Excess |
In P-N junction, avalanche current flows in circuit when biasing is
| (a) Forward | (b) Reverse | (c) Zero | (d) Excess |
(b) Reverse
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Two spheres A and B of radius ‘a’ and ‘b’ respectively are at same electric potential. The ratio of the surface charge densities of A and B is
|
(a) |
(b) |
(c) |
(d) |
The capacitor of capacitance 4μF and 6 μF are connected in series. A potential difference of 500 volts applied to the outer plates of the two capacitor system. Then the charge on each capacitor is numerically
|
(a) 6000 C |
(b) 1200 C |
(c) 1200 μC |
(d) 6000 μC |
The equivalent resistance between points A and B of an infinite network of resistances each of 1Ω connected as shown, is
|
(a) Infinite |
(b) 2 Ω |
(c) |
(d) Zero |
A NPN transistor conducts when
|
(a) Both collector and emitter are positive with respect to the base |
|
(b) Collector is positive and emitter is negative with respect to the base |
|
(c) Collector is positive and emitter is at same potential as the base |
|
(d) Both collector and emitter are negative with respect to the base |
Which of the following statements is not true
|
(a) The resistance of intrinsic semiconductors decrease with increase of temperature |
|
(b) Doping pure Si with trivalent impurities give P-type semiconductors |
|
(c) The majority carriers in N-type semiconductors are holes |
|
(d) A PN-junction can act as a semiconductor diode |
A magnet of magnetic moment M is rotated through 360° in a magnetic field H, the work done will be
| (a) MH | (b) 2MH | (c) 2πMH | (d) Zero |