મુખ્ય સામગ્રી પર જાઓ

State PCS PYQPrelims 2023

BPSC – Combined Competitive Examination · પ્રશ્ન 27

Current density is:

a scalar quantity
a vector quantity
dimensionless
None of the above

જવાબ બતાવો અને સમજૂતી

જવાબ: (B) a vector quantity

સમજૂતી

Current density J = I/A points in the direction of positive charge flow, so it is a vector.

(A) ખોટો
Wrong: current is scalar, but current density has direction.
(B) સાચો
Correct: current density J has magnitude and direction (A/m²).
(C) ખોટો
Wrong: it has units of A/m².
(D) ખોટો
Wrong: it is a vector.