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CBSE

NEET Physics : Electric Charges and Fields

Multiple Choice Questions

81.

The number of electron in 2 coulomb of charge is

5 × 10²⁹
12.5 × 10¹⁸
1.6 × 10¹⁹
9 × 10¹¹

82.

Which of the following materials is the best conductor of electricity ?

Platinum
Gold
Silicon
Copper

83.

A charge +q is placed at the origin O of x-y axes as shown in the figure. The work done in taking a charge Q from A to B along the straight line AB is

$\frac{qQ}{4 {πε}_{0}} (\frac{a - b}{ab})$
$\frac{qQ}{4 {πε}_{0}} (\frac{b - a}{ab})$
$\frac{qQ}{4 {πε}_{0}} (\frac{b}{a^{2}} - \frac{1}{b})$
$\frac{qQ}{4 {πε}_{0}} (\frac{a}{b^{2}} - \frac{1}{b})$

84.

A point charge +q is placed at the centre of a cube of side L. The electric flux emerging from the cube is

$\frac{q}{ε_{0}}$
zero
$\frac{6 {qL}^{2}}{ε_{0}}$
$\frac{q}{6 L^{2} ε_{0}}$

85.

In a region, the intensity of an electric field is given by E = 2i + 3j+ k in Nc^-1. The electric flux through a surface S = 1Oi m²in the region is

5 Nm²C^-1
10 Nm²C^-1
15 Nm²C^-1
20 Nm²C^-1

86.

A point charge + q is placed at the midpoint of a cube of side a. The electric flux emerging from the cube is

zero
$\frac{3 {qa}^{2}}{ε_{0}}$
$\frac{q}{ε_{0}}$
$\frac{ε_{0}}{4 {qa}^{2}}$

Short Answer Type

87.

Write down the relation between tesla and gauss.

Multiple Choice Questions

88.

Two infinite parallel metal planes, contain electric charges with charge densities +σ and -σ respectively and they are separated by a small distance in air. If the permittivity of air is ε₀,then the magnitude of the field between the two planes with its direction will be

σ/ε₀ towards the positively charged plane
σ/ε₀towards the negatively charged plane
σ/(2ε₀) towards the positively charged plane
0 and towards any direction

89.

Two pith balls carrying equal charges are suspended from a common point by strings of equal length, the equilibrium separation between them is r. Now the strings are rigidly clamped at half the height. The equilibrium separation between the balls now become

${(\frac{1}{\sqrt{2}})}^{2}$
$(\frac{r}{\sqrt[3]{2}})$
$(\frac{2 r}{\sqrt{3}})$
$(\frac{2 r}{3})$

90.

Four charges equal to -Q are placed at the four corners of a square and a charge q is at its centre. If the system is in equilibrium, the value of q is

$\frac{- Q}{4} (1 + 2 \sqrt{2})$
$\frac{Q}{4} (1 + 2 \sqrt{2})$
$\frac{- Q}{2} (1 + 2 \sqrt{2})$
$\frac{Q}{2} (1 + 2 \sqrt{2})$

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Subject

NEET Physics : Electric Charges and Fields

Multiple Choice Questions

Short Answer Type

Multiple Choice Questions