Two small spheres each carrying a charge q are placed r metre apart. If one of the spheres is taken around the other one in a circular path of radius r, the work done will be equal to

• Force between them × r

• Force between them × 2πr

• Force between them/2πr

• Zero

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

A hollow metal sphere of radius 5 cm is charged so that the potential on its surface is 10 V. The potential at the centre of the sphere is

• 0 V

• 10 V

• Same as at point 5 cm away from the surface

• Same as at point 25 cm away from the surface

A charge Q placed at the centre of two charges + q and + q. the system is in equilibrium then net force experienced by Q.

• Zero

• F

• At equilibrium, net force will be zero

• F/2

Tags

NGSS.HS-PS2-2

NGSS.HS-PS2-4

• 1m

• -1m

• 2m

• None of these

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

Two conducting spheres of radius r1 and r2

are at the same potential. The ratio of their charges is:

Tags

NGSS.HS-PS2-4

For a set of oppositely charged, infinite parallel plates, what is true about the electric field inside and outside the plates?

• The electric field decreases as you move from the positive to the negative plate and is a non-zero constant outside.

• The electric field decreases as you move from the positive to the negative plate and is non-zero constant outside.

• The electric field is a non-zero constant within the plates and zero outside

• The electric field is zero within the plates and a non-zero constant outside

Two protons A and B are placed is between the two plates of a parallel plate capacitor charged to a potential difference V as shown in figure. The force on two protons are F_A and F_B ; then

• F_A > F_B

• F_A < F_B

• F_A = F_B

• Nothing can be predicted

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

The dielectric constant of metals is        

• One

• Zero

• Infinity

• Greater than one

The capacity of a parallel plate condenser is 5μF. When a glass plate is placed between the plates of the conductor, its potential becomes 1/8th of the original value. The value of dielectric constant will be

• 1.6

• 5

• 8

• 40

The diagram shows four pairs of large parallel conducting plates. The value of the electric potential is given for each plate. Rank the pairs according to the magnitude of the electric field between the plates, least to greatest.

• 1, 2, 3, 4

• 4, 3, 2, 1

• 2, 3, 1, 4

• 2, 4, 1, 3

Tags

NGSS.HS-PS3-5