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The magnetic field existing in a region is given by
\[
\mathbf{B}=B_{0}\left[1+\frac{x}{l}\right] \hat{\mathbf{k}}
\]
\( \mathrm{P} \)
A square loop of edge \( l \) and carrying current \( I \) is placed with its edges parallel to the \( x y \)-axis.
W The magnitude of the net magnetic force experienced by the loop is
(a) \( 2 B_{0} I l \)
(b) zero
(c) \( B_{0} I l \)
(d) \( 4 B_{0} I l \)
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