Coulomb’s law MCQs
We know that the point charge exerts force of attraction or repulsion of another charge in its region. Like charges repels and unlike charges attracts. The magnitude of force of attraction or repulsion between the charges is explained with the help of Coulomb’s law.
Consider two point charges q1 and q2 at rest and separated by distance of r as shown below,
Coulomb’s law states as, ‘The force of attraction or repulsion between the charges at rest is directly proportional to the product of magnitude of charges and inversely proportional to square of distance between them’.
Mathematically it can be written as,
Q.1) Unlike charges can………….each other.
a) attracts each other
b) repels each other
c) either attracts or repels
d) neither attracts nor repels
Q.2) Who among the following illustrated the law for explanation of force between point charges?
a) A. Ampere
b) M. Faraday
c) I. Newton
d) C. Coulomb
Q.3) Which among the following law is also analogous the Coulomb’s law that obeys inverse square law.
a) Faradays law of electromagnetic induction
b) Ampere’s circuital law.
c) Kepler’s laws of planetary motion
d) Newton’s law of gravitation.
Q.4) The force of attraction between two unlike point charges is F, magnitude of force if distance between the point charges gets tripled will be……….
a) 9 F
b) 3 F
c) (1/9) F
d) (1/3) F
Q.5) Two charges of magnitude each of 5 µC and 10 µC separated by distance of 1 m from each other, magnitude of force between the charges is……….
a) 0.450 N
b) 4.50 N
c) 45.0 N
d) 450 N
Q.6) Magnitude of force of attraction or repulsion between charges each of 1 C separated by 1 m is……..
a) 9 x 109 N
b) 9 x 10-9 N
c) 9 x 109 dyne
d) 9 x 10-9 dyne
Q.7) Ratio of permittivity of medium to permittivity of free space is known as…….
a) electric flux
b) charge density
c) energy density
d) dielectric constant
Q.8) The force between two charges will be……….actual force, if the space between them is filled by marble slab of dielectric constant 8.
a) 8 times
b) (1/8) times
c) 64 times
d) (1/64) times
Q.9) Ratio of the forces between the charges placed in free space to that of charges kept in medium of permittivity 4 is…..
a) 1:4
b) 4:1
c) 1:16
d) 16:1
Answers
Q.1) a) attracts each other
Q.2) d) C. Coulomb
Q.3) d) Newton’s law of gravitation.
Q.4) c) (1/9) F
Q.5) a) 0.450 N
Q.6) a) 9 x 109 N
Q.7) d) dielectric constant
Q.8) b)(1/8) times
Q.9) b) 4:1