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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` |
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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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