A wire PQR is bent as shown in figure and is placed in a region of uniform magnetic field B. The length of PQ = QR = l. A current I ampere flows through the wire as shown. The magnitude of the force on PQ and QR will be
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a
BIl, 0
b
2BIl, 0
c
0, BIl
d
0 , 0
answer is C.
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Detailed Solution
PQ experience no force as B→ is parallel to lQR experience a force = ilBHere B→ is perpendicular to l.