MCQs of Electric Charges and Electric Fields

Electric Charges and Electric Fields MCQs

MCQs of Electric Charges and Electric Fields

Showing 51 to 60 out of 141 Questions

51.

When an electron and a proton are both placed in an electric field _____ .

(a)	the electric forces acting on them are equal in magnitude as well as direction.
(b)	only the magnitudes of forces are same
(c)	accelerations produced in them are same
(d)	magnitudes of accelerations produced in them are same.

52.

The electric force acting between two point charges kept at a certain distance in vacuum is α. If the same two charges are kept at the same distance in a medium of dieelectric constant K. The electric force acting between them is ____.

(a)	$α$
(b)	$Kα$
(c)	$K^{2} α$
(d)	$\frac{α}{K}$

53.

The distance between two point charges 4q and -q is r. A third charge Q is placed at their midpoint. The resultant force acting on -q is zero then Q = _____.

(a)	-q
(b)	q
(c)	-4q
(d)	4q

54.

The linear charge density on the circumference of a circle of radius 'a' varies as λ=λ₀cosθ. The total charge on it is _____.

(a)	zero
(b)	infinite
(c)	πaλ₀
(d)	2πa

55.

Two identical metal spheres A and B carry same charge q. When the two spheres are at distance r from each other, the force acting between them is F. Another identical sphere C is first brought in contact with A, then it is touched to sphere B and then separated from it. Now the force acting between A and B at the same distance is _____

(a)	F
(b)	2F
(c)	$\frac{3 F}{8}$
(d)	$\frac{F}{4}$

56.

Two point charges of q and 4q are kept 30 cm apart. At a distance _____, on the straight line joining them, the intensity of electric field is zero.

(a)	20 cm from 4q
(b)	7.5 cm from q
(c)	15 cm from 4q
(d)	5 cm from q

57.

The dimensions of permittivity [ε₀] are _____ .Take Q as the dimension of charge.

(a)	M¹L^-2T^-2Q^-2
(b)	M^-1L²T^-3Q^-1
(c)	M^-1L^-3T²Q²
(d)	M^-1L³T^-2Q^-2

58.

The electric dipole moment of an HCL atom is 3.4 × 10^-30 Cm. The charges on both atoms are unlike and of same magnitude. Magnitude of this charge is _____ . The distance between the charges is 1 Å

(a)	1.7 × 10^-20 C
(b)	3.4 × 10^-20 C
(c)	6.8 × 10^-20 C
(d)	3.4 × 10^-10 C

59.

There exists an electric field of 100 N/C along Z-direction. The flux passing through a square of 10 cm sides placed on XY plane inside the electric field is _____.

(a)	$1.0 {Nm}^{2} / C$
(b)	2.0 Vm
(c)	10 Vm
(d)	$4.0 {Nm}^{2} / C$

60.

The radius of a conducting spherical shell is 10 mm and a 100 μC charge is spread on it. The force acting on a 10 μC charged placed at its centre is _____. k = 9×10⁹ MKS.

(a)	10³N
(b)	10²N
(c)	zero
(d)	10⁵N

Showing 51 to 60 out of 141 Questions