n identical bulbs, each designed to draw a power p from a certain voltage supply, are joined in series across that supply. The total power which they will draw is
|
(a) |
(b) p/n |
(c) p |
(d) np |
(b) p/n
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To charges 
and 
are placed 30 cm apart, shown in the figure. A third charge 
is moved along the arc of a circle of radius 40 cm from C to D. The change in the potential energy of the system is 
, where k is
|
(a) 8
|
(b) 
|
(c) 
|
(d) 
|
A parallel plate capacitor has circular plates of 0.08m radius and 1.0 
separation. If a P.D. of 100 volt is applied, the charge will be
|
(a) 1.8 |
(b) 1.8 |
(c) 1.8 |
(d) None of these |
In NPN transistor the collector current is 10 mA. If 90% of electrons emitted reach the collector, then
|
(a) Emitter current will be 9 mA |
(b) Emitter current will be 11.1 mA |
|
(c) Base current will be 0.1 mA |
(d) Base current will be 0.01 mA |
The charge density in a nucleus varies with distance from the centre of the nucleus according to the curve in Fig.
|
(a)
|
(b)
|
(c)
|
(d)
|
