Question

Identify the dimensional formula of electric current.

(a) [M L T^-2]

(b) [M^0 L^0 T^0 A^1]

(c) [M L^3 T^0]

(d) [M L^2 T^-3]

This question was posed to me in semester exam.

Question is from Electric Current in portion Current Electricity of Physics – Class 12

Answer 1

The correct answer is (b) [M^0 L^0 T^0 A^1]

Explanation: The flow of charge per unit time is defined as current. The fundamental unit of current is Ampere (named after Andre Marie Ampere).

Hence the dimensional formula of electric current is [M^0 L^0 T^0 A^1].