Top 10 Questions

## Electric Charges And Fields

- Running short of time? Practice top 10 questions of the chapter and boost your confidence
1

Two charges each of micro coulomb are separated in a medium of relative permittivity  by a distance of . The force between them is :

A
B
C
D
Two particles having charges and exert a force on each other, when they are placed at a certain distance. What will be the force between them, if the distance between them is reduced to half and the charge on each particle is doubled ?
A
B
C
D
Four charges are arranged at the corners of a square ABCD as shown in figure. The force on a positive charge 'Q' kept at the centre of the square is :
A
zero
B
along diagonal AC
C
along diagonal BD
D
perpendicular to the side AB
A hemisphere body of radius is placed in a uniform electric field . What is the flux linked with the curved surface if the field is perpendicular to the base?
A
B
C
D

The dipolemoment of the given system is:

A
along perpendicular bisector of line
B
along perpendicular bisector of line
C
along perpendicular bisector of line
D
A long string with a charge of per unit length passes through an imaginary cube of edge length . The maximum flux of the electric field through the cube will be:
A
B
C
D
A charged particle q of mass m is in equilibrium at a height h from a horizontal infinite line charge with uniform linear charge density . The charge lies in the vertical plane containing the line charge. If the particle is displaced slightly (vertically), prove that the motion of the charged particle will be simple harmonic. Also find its time period
The total solid angle subtended by the sphere is
A
B
C
D
E
Two point charges A and B, having charges +Q and -Q respectively, are placed at certain distance apart and force acting between them is F. If 25% charge of A is transferred to B, then force between the charges becomes
A
B
C
D
Which of the following statements are correct?
A
Electric field calculated by Gauss law is the field due to only those charges which are enclosed inside the Gaussian surface
B
Gauss law is applicable only when there is a symmetrical distribution of charge
C
Electric flux through a closed surface will depends only on charges enclosed within that surface only
D
None of these