A parallel plate capacitor of area A, plate separation d and capacitance C is filled with three different dielectric materials having dielectric constants 
and 
as shown. If a single dielectric material is to be used to have the same capacitance C in this capacitor, then its dielectric constant k is given by
(a) 
|
(b) 
|
|
(c) k = |
(d) |
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The coils of a step down transformer have 500 and 5000 turns. In the primary coil an ac of 4 ampere at 2200 volts is sent. The value of the current and potential difference in the secondary coil will be
|
(a) 20 A, 220 V |
(b) 0.4 A, 22000 V |
(c) 40 A, 220 V |
(d) 40 A, 22000 V |
In a current carrying long solenoid, the field produced does not depend upon
|
(a) Number of turns per unit length |
(b) Current flowing |
|
(c) Radius of the solenoid |
(d) All of the above three |
The curve between charge density and distance near P-N junction will be
(a)
|
(b)
|
(c)
|
(d)
|
In a triode amplifier, 
kilo ohm and load resistance 
kilo ohm. If the input signal voltage is 0.5 volt, then output signal voltage will be
|
(a) 1.25 volt |
(b) 5 volt |
(c) 2.5 volt |
(d) 10 volt |
The electric field near a conducting surface having a uniform surface charge density σ is given by
|
(a) |
(b) |
|
(c) |
(d) |
