Magnetic field due to currentHard
Question
Two thick wires and two thin wires, all of the same materials and same length form a square in the three different ways P, Q and R as shown in fig with current direction shown. the magnetic field at the centre of the square is zero in cases
Options
A.in P only
B.in P and Q only
C.in Q and R only
D.P and R only
Solution
Effective resistance in each upper and lower arms are equal. Hence equal currents flows and produces zero M.F. in P and R configuration.
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