Untitled Document

Question Bank No: 3

1. Equivalent capacitance between P and Q with given circuit is
phepc8

a)		$3 μ F$
b)		$2 μ F$
c)		$4 μ F$
d)		$1 μ F$

2. The empty space between the plates of a capacitor is filled with a liquid of dielectric constant k. Then the capacitive of the capacitor

a)		increases by a factor k
b)		decreases by a factor k
c)		increases by a factor $k^{2}$
d)		decreases by a factor $k^{2}$

3. A charge is located at the centre of a circle of radius r. Another charge of the same magnitude q is taken round the circle. The work expended in the process is

a)		$\frac{1}{4 π \in_{0} r}$
b)		$\frac{q^{2}}{4 π \in_{0} r}$
c)		$\frac{q^{2}}{4 π \in_{0} r^{2}}$
d)		zero

4. A particle of mass m and charge q moves through a p.d of V volt. The velocity acquired by it is

a)		$\sqrt{\frac{2 q V}{m}}$
b)		$\sqrt{\frac{m}{2 q V}}$
c)		$\sqrt{\frac{2 q m}{V}}$
d)		$\frac{2 q V}{m}$

5. In a charged capacitor the energy is stored in

a)		the field between the plates
b)		in the positive charges
c)		in the negative charges
d)		on the plates

6. A parallel place capacitor has a capacitance of 50 $μ F$ in air and 110 $μ F$ when immersed in oil. The dielectric constant K of oil is

a)		0.45
b)		0.55
c)		1.10
d)		2.20

7. The capacity of a parallel plate capacitor is c. Its capacity when the seperation between the plates is halved will be

a)		4C
b)		2C
c)		C/2
d)		C/4

8. The ratio of the effective capacities of two equal capacitances connected in series and in parallel is

a)		1 : 4
b)		4 : 1
c)		1 : 2
d)		2 : 1