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NEET Physics : Electrostatic Potential and Capacitance

Multiple Choice Questions

51.

Two small balls, each carrying a charge q are suspended by equal insulator strings of length l m from the hook of a stand. This arrangement is carried in a satellite in space. The tension in each string will be

$\frac{1}{4 {πε}_{0}} \frac{q}{l^{2}}$
$\frac{1}{4 {πε}_{0}} \frac{q^{2}}{4 l^{2}}$
$\frac{1}{4 {πε}_{0}} \frac{q^{2}}{l^{2}}$
$\frac{1}{(4 {πε}_{0})} \frac{q}{l}$

52.

Magnetic field of the earth is H =0.3 g. A magnet is vibrating 5 oscillations per min then the dippreciation required in the magnetic field of the earth of increase time period upto 10 oscillations per minute is

2.25 g
0.6 g
0.9 g
0.12 g

53.

If V =ary, then electric field at a point will be proportional to

r
r ^-1
r^-2
r²

54.

Electric field at point 20 cm away from the centre of dielectric sphere is 100 V/m, radius of sphere is 10 cm, then the value of electric field at a distance 3 cm from the centre is

100 V/m
125 V/m
120 V/m
0

55.

A charged particle is accelerated by a potential of 200 V. If its velocity is 8.4 × 10⁸ m/s, then value of e/m for that particle is

17.6 × 10¹⁶
14.5 × 10¹²
1.76 × 10¹⁵
1.45 × 10¹⁵

56.

A parallel plate capacitor with air as the dielectric has capacitance C. A slab of dielectric constant K and having the same thickness as the separation between the plates is introduced so as to fill one-fourth of the capacitor as shown in the figure. The new capacitance will be

$(K + 3) \frac{C}{4}$
$(K + 2) \frac{C}{4}$
$(K + 1) \frac{C}{4}$
$\frac{KC}{4}$

57.

Three capacitors of capacitances 1 µF, 2µF and 4μF are connected first in a series combination and then in a parallel combination. The ratio their equivalent capacitances will be

2 : 49
49 : 2
4 : 49
49 : 4

58.

Two capacitors of capacities C₁ and C₂ are charged upto the potential V₁ and V₂ then condition for not flowing the charge between on connected them in parallel is

C₁ = C₂
C₁V₁ = C₂V₂
V₁ =V₂
$\frac{C_{1}}{V_{2}} = \frac{C_{2}}{V_{2}}$

59.

A parallel palte condenser is filled with two dielectrics as shown in figure. Area of each pate is A m² and the separation is d metre. The dielectric constants are K₁ and K₂ respectively. Its capacitance in farad will be

$\frac{2 ε_{o} A}{d} (\frac{K_{1} + K_{2}}{K_{1} K_{2}})$
$\frac{2 ε_{o} A}{d} (\frac{K_{1} K_{2}}{K_{1} + K_{2}})$
$\frac{ε_{o} A}{d} (\frac{K_{1} + K_{2}}{2 K_{1} K_{2}})$
$\frac{ε_{o} A K_{1} K_{2}}{2 (d_{2} K_{1} + d_{1} K_{2})}$

60.

Two equal negative charges - q are fixed at the point (0, a) and (0, - a) on the y-axis. A positive charge Q is released from rest at the point (2a, 0) on the x-axis. The charge wil

execute SHM about the origin
move to the origin and remain at rest
move to infinity
execute oscillatory but not SHM

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NEET Physics : Electrostatic Potential and Capacitance

Multiple Choice Questions