Question No. 32 The strength of the magnetic field at a point 10cm from a long straight current carrying wire is B. The magnetic field induction at a distance of 5cm from the wire is:
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Explanation:
B is inversely proportional to distance
B' r1=B" r2
w.k.t B'=B;r1=10cm;r2=5cm
B×10=B"×5
:.B''=2B
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