Question

Match the following:

a) mass e) invariant

b) charge f) only attractive

c) coulomb force g) may be variant

d) gravitational force h) may be repulsive

• A. a - f, b - g, c - h, d - e
• B. a - g, b - e, c - f, d - h
• C. a - g, b - e, c - h, d - f
• D. a - g, b - h, c - e, d - f

Answer 1

Answer: (C)

a - g, b - e, c - h, d - f

(1) Mass is variant, According to Einsteins equation, when a body is travelling with speed comparable to that of light, its mass changes.
(2) Charge is invariant. It is independent of velocity.
(3) Coulombs force acts on charges & therefore can be repulsive depending upon the nature of charge (for like charges).
(4) Masses attract each other by Gravitational force & therefore it is only attractive in nature.