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Questions  

A square frame, made of copper wire is carrying a current i=12 A. Length of side of the square is 1 m. If the frame is placed in a magnetic region where B1=1 μT and B2=2 μT, then net force experienced by the square frame is 

a
12×10-6 N
b
36×10-6 N
c
24×10-6 N
d
18×10-6 N

detailed solution

Correct option is B

Fnet =iℓB1+iℓB2=12×1×(1+2)×10-6 N=36×10-6 N

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Two infinitely current carrying insulated wires AB and CD are carrying same current  I. The wires cross each other at right angles as shown in figure. Three identical conductors P1Q1 , P2Q2 and P3Q3, carrying same current are placed a shown in figure and the forces acting on them are F1 , F2 and F3 respectively. Then select the correct option.


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