MCQs of Electric Charges and Electric Fields

Electric Charges and Electric Fields MCQs

MCQs of Electric Charges and Electric Fields

Showing 101 to 110 out of 141 Questions

101.

The force acting between two opposite charges of equal magnitude is F. If 25% charge is transferred from one to another, then the force acting between them will be _____.

(a)	$\frac{15}{16} F$
(b)	F
(c)	$\frac{4}{5} F$
(d)	$\frac{9}{16} F$

102.

On each vertices of an equilateral triangle, charge +q is placed. If the force acting between any two charges is F, then find out the resultant force on any of the charge.

(a)	3F
(b)	2F
(c)	$\sqrt{3} F$
(d)	$\sqrt{2} F$

103.

If an electron and a proton are in an uniform electric field, the ratio of their acceleration will be ______.

(a)	zero
(b)	1
(c)	$\frac{m_{p}}{m_{e}}$
(d)	$\frac{m_{e}}{m_{p}}$

104.

The number of electrons to be put on a spherical conductor of radius 0.1 m to produce an electric field of 0.036 N/C just above its surface is _____.

(a)	2.7 × 10⁵
(b)	2.5 × 10⁵
(c)	2.6 × 10⁵
(d)	2.4 × 10⁵

105.

A charged water drop whose radius is 0.1 µm is in equilibrium in an electric field. If charge on it is equal to the charge of an electron, then intensity of an electric field will be _____.

(a)	1610 $\frac{N}{C}$
(b)	26.2 $\frac{N}{C}$
(c)	1.61 $\frac{N}{C}$
(d)	262 $\frac{N}{C}$

106.

If a sphere of radius 1cm has potential of 8000 V, then energy density near its surface will be _____.

(a)	$64 \times 10^{5} \frac{J}{m^{3}}$
(b)	$2.83 \frac{J}{m^{3}}$
(c)	$8 \times 10^{3} \frac{J}{m^{3}}$
(d)	$32 \frac{J}{m^{3}}$

107.

The dimension formula of

(\frac{1}{2}) ε_{0} E^{2}

is _____.

(a)	M¹L²T^-1
(b)	M¹L^-1T^-2
(c)	M¹L¹T^-1
(d)	M¹L²T^-2

108.

Electric charges q, q, -2q are placed at the corners of an equilateral triangle ABC of side l. The magnitude of electric dipole moment of the system is _____.

(a)	4pl
(b)	2ql
(c)	ql
(d)	√3 ql

109.

In the case of an electric dipole moment, when the distance of a point on the equator is doubled and charges are increased 8 times, the field at the new distance is _____.

(a)	64 times the field at the initial distance
(b)	same as that of the initial distance
(c)	$\frac{1}{64}$ times the field at the initial distance
(d)	none of above

110.

If 1mC charge is uniformly distributed over a 50 cm long straight wire, then the linear charge density is _____.

(a)	0.002 C/m
(b)	0.5 C/m
(c)	0.02 C/m
(d)	2 C/m

Showing 101 to 110 out of 141 Questions