Question

Which of the following statements are true:

A: Charge cannot exist without mass but mass can exist without charge
B: Charge is invariant but mass varies with velocity
C: Charge is conserved but mass alone may not be conserved

• A. A, B, C are true
• B. A, B, C are not true
• C. A, B are only true
• D. A, B are false, C is true

Answer 1

The correct option is A A, B, C are true

A) Charged body has electrons which has mass whereas a body (with mass) can be neutral (no charge).

B) Mass is variant. According to Einsteins' equation, when a body is travelling with speed comparable to that of light, its mass changes as:

$m_f=\frac{m_i}{\sqrt{1-\frac{v^2}{c^2}}}$
C) Charge is invariant. It is independent of velocity.