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 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 $B_{1} = 1 μT and B_{2} = 2 μT,$ then net force experienced by the square frame is

A
$12 \times 10^{- 6} N$
B
$36 \times 10^{- 6} N$
C
$24 \times 10^{- 6} N$
D
$18 \times 10^{- 6} N$

Solution:

$F_{net} = i ℓ B_{1} + i ℓ B_{2} = 12 \times 1 \times (1 + 2) \times 10^{- 6} N = 36 \times 10^{- 6} N$

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