A) scalar quantity
B) vector quantity
C) constant
D) none of these
Correct Answer: B
Solution :
A current carrying solenoid or a coil behaves like a bar magnet A bar magnet having north and south poles at its ends is a magnetic dipole. If i be the current, A the area, N the number of turns, then magnetic dipole moment \[\vec{M}=Ni\,\vec{A}.\]It is a vector quantity and its direction is same as the direction of the area vector \[\vec{A}\]of the current loop. This direction is given by a curved straight right hard rule.
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