BPSC – Combined Competitive Examination · প্রশ্ন 27
Current density is:
উত্তর দেখান ও ব্যাখ্যা
উত্তর: (B) a vector quantity
ব্যাখ্যা
Current density J = I/A points in the direction of positive charge flow, so it is a vector.
- (A) ভুল
Wrong: current is scalar, but current density has direction.
- (B) সঠিক
Correct: current density J has magnitude and direction (A/m²).
- (C) ভুল
Wrong: it has units of A/m².
- (D) ভুল
Wrong: it is a vector.