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  4. A wire bent in the form a right-angled triangle PQR, carries a current 1 A. It is placed in a region of a uniform magnetic field B= 0.2 T. If PR = 1 m, the net force on the wire is <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-krjpqlauxt7y.png />

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Q. A wire bent in the form a right-angled triangle PQR, carries a current 1 A. It is placed in a region of a uniform magnetic field B= 0.2 T. If PR = 1 m, the net force on the wire is

Question

NTA AbhyasNTA Abhyas 2020Moving Charges and Magnetism

Solution:

$\overset{ \rightarrow }{F} = i \left[\right. \overset{ \rightarrow }{\ell } \times \overset{ \rightarrow }{B} \left]\right.$
$\forall \overset{ \rightarrow }{\ell }$ = Vector length
here $\overset{ \rightarrow }{F}$ = 0, for closed loop