A rectangular loop carrying a current i is placed in a uniform magnetic field B. The area enclosed by the loop is A. If there are n turns in the loop, the torque acting on the loop is given by [MP PMT 1994]

\[ni\,\overrightarrow{A}\cdot \overrightarrow{B}\]

\[ni\,\overrightarrow{A}\times \overrightarrow{B}\]

\[\frac{1}{n}(i\overrightarrow{A}\times \overrightarrow{B})\]

\[\frac{1}{n}(i\overrightarrow{A}\cdot \overrightarrow{B})\]

A rectangular loop carrying a current i is placed in a uniform magneti

1.	A rectangular loop carrying a current i is placed in a uniform magnetic field B. The area enclosed by the loop is A. If there are n turns in the loop, the torque acting on the loop is given by [MP PMT 1994]
A.	\[ni\,\overrightarrow{A}\times \overrightarrow{B}\]
B.	\[ni\,\overrightarrow{A}\cdot \overrightarrow{B}\]
C.	\[\frac{1}{n}(i\overrightarrow{A}\times \overrightarrow{B})\]
D.	\[\frac{1}{n}(i\overrightarrow{A}\cdot \overrightarrow{B})\]
Answer» B. \[ni\,\overrightarrow{A}\cdot \overrightarrow{B}\]