Coulombs Law Short Questions and Answers

41 As one penetrates a uniformly charged sphere, the electric flied strength E

A increases

B decreases

C is zero at all points

D remains same as at surface

Answer: increases

42 A charged oil drop is stationary between a pair of horizontal parallel plates. If the drop carries a charge 3.2×10-10 coulomb and has a mass 1.6×10-19 kg, then the potential difference between the plates is

A 50 V

B 80 V

C 100 V

D cannot be calculated on the basis of given data

View Answer

Answer: 80 V

43 An electric field can deflect

A x-rays

B neutrons

C α-particles

D γ-rays

View Answer

Answer: α-particles

44 Electric lines of force enter or leave a charged surface at an angle of

A 90°

B 30°

C 60°

D depends upon surface condition

View Answer

Answer: 90°

45 One thousand electrons, each of which carries a charge of -1.6×10-12 coulomb are removed from an initially neutral pitch ball. The resulting charge on the pitch ball is

A 1.6×10-15 coulomb

B 1.6×10-23 coulomb

C -1.6×10-15 coulomb

D All Of The Above

View Answer

Answer: 1.6×10-15 coulomb

46 Midway between two equal and similar charges, a third equal and similar charge is placed, then this third charge will

A remain in stable equilibrium

B be in unstable equilibrium

C not be in equilibrium

D Any Of The Above

View Answer

Answer: remain in stable equilibrium

47 One volt is the same as

A one joule

B one coulomb

C one joule/coulomb

D None of the above

View Answer

Answer: one joule/coulomb

48 When a dielectric is placed in an electric field, the field strength

A increases

B decreases

C remains unchanged

D reduces to zero

View Answer

Answer: decreases

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

A 10 V

B 0 V

C same as at point 5 cm away from the surface

D same as at point 25 cm away from the surface

View Answer

Answer: 10 V

50 Out of the material given below, which has the highest dielectric strength

A glass

B mica

C oiled paper

D None Of The Above

View Answer

Answer: glass

51 Two equal and similar charges are placed a finite distance apart. A third equal and dissimilar charge is placed midway between them. The third charge will be

A in stable equilibrium

B in unstable equilibrium

C neutralized

D oscillating

View Answer

Answer: in unstable equilibrium

52 A tiny particle carrying a charge of 0.3 C is accelerated through a potential difference of 1000 V. The kinetic energy acquired by the particle is

A 900 J

B 400 J

C 100 J

D 300 J

View Answer

Answer: 300 J

53 Two copper spheres A and B are of the same radii. Sphere A is hollow and Sphere B is solid. If both spheres are charged to the same potential

A Both will hold the same charge

B A will hold more charge as compared to B

C B will hold more charge as compared to A

D Both will not hold any charge

View Answer

Answer: Both will hold the same charge

54 A parallel plate capacitor connected to a battery stores twice as much charge with a given dielectric as it does with air as dielectric, the susceptibility of the dielectric is

A 0

B 1

C 2

D 3

View Answer