1. Eight drops of mercury of equal radii possessing equal
charges combine to form a big drop. Then the capacitance of
bigger drop compared to each individual small drop is
a) 8 times
b) 4 times
c) 2 times
d) 32 times
Explanation:
2.A condenser of capacity \[50 \mu F\] is charged to 10 volts . Its
energy is equal to
a) \[2.5\times10^{-3}joule\]
b) \[2.5\times10^{-4}joule\]
c) \[5\times10^{-2}joule\]
d) \[1.2\times10^{-8}joule\]
Explanation:
3.The potential gradient at which the dielectric of a condenser
just gets punctured is called
a) Dielectric constant
b) Dielectric strength
c) Dielectric resistance
d) Dielectric number
Explanation: Dielectric strength
4. A parallel plate condenser has a capacitance 50 \[\mu F\] in air
and \[110 \mu F\] when immersed in an oil. The dielectric
constant 'k' of the oil is
a) 0.45
b) 0.55
c) 1.10
d) 2.20
Explanation:
5. Separation between the plates of a parallel plate capacitor is
d and the area of each plate is A . When a slab of material
of dielectric constant k and thickness t(t< d)is introduced
between the plates, its capacitance becomes
a) \[\frac{\epsilon_{0}A}{d+t\left(1-\frac{1}{k}\right)}\]
b) \[\frac{\epsilon_{0}A}{d+t\left(1+\frac{1}{k}\right)}\]
c) \[\frac{\epsilon_{0}A}{d-t\left(1-\frac{1}{k}\right)}\]
d) \[\frac{\epsilon_{0}A}{d-t\left(1+\frac{1}{k}\right)}\]
Explanation:
6.The capacity of parallel plate condenser depends on
a) The type of metal used
b) The thickness of plates
c) The potential applied across the plates
d) The separation between the plates
Explanation:
7.The energy of a charged capacitor resides in
a) The electric field only
b) The magnetic field only
c) Both the electric and magnetic field
d) Neither in electric nor magnetic field
Explanation: Stationary charge produces electric field only.
8. No current flows between two charged bodies connected
together when they have the same
a) Capacitance or
\[\frac{Q}{V}\]
ratio
b) Charge
c) Resistance
d) Potential or
\[\frac{Q}{C}\]
ratio
Explanation: Potential or \[\frac{Q}{C}\] ratio
9. The capacity of a parallel plate condenser is C . Its capacity
when the separation between the plates is halved will be
a) 4C
b) 2 C
c) \[\frac{C}{2}\]
d) \[\frac{C}{4}\]
Explanation:
10. Eight small drops, each of radius r and having same charge
q are combined to form a big drop. The ratio between the
potentials of the bigger drop and the smaller drop is
a) 8 : 1
b) 4 : 1
c) 2 : 1
d) 1 : 8
Explanation:
