1.

A square loop of side 2cm carrying current `I_(0)` is placed in x-y plane in a magnetic field `B= (4hat(i)+3hat(j))` T Find the unit vector along the axis about which it will start rotating. A. `(4hat(j)+3hat(i))/5`B. `(-4hat(j)-3hat(i))/5`C. `(-4hat(j)+3hat(i))/5`D. `(4hat(j)-3hat(i))/5`

Answer» Correct Answer - C
Magnetic moment is in divection of - `za^(x)`
and`vec(B)=4hat(i)+3hat(j)`
`vec(B)=4/5hat(i)+3/5hat(j)`
`mu=ivec(A)`
`=-(4xx10^(-4)xxI_(0))hat(k)`
`hat(tau)=muxxhat(B)`
`hat(tau)=4/5hat(j)-3/5hat(i)`
Thus the unit vector of the axis is `pm hat(tau)`


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