Question

A square loop of side a is placed at a distance a away from a long wire carrying a current I₁. If the loop carries a current I₂ as shown in Fig. then the nature of the force and its amount is–

• A. , attractive
• B. $\frac { \mu _ { 0 } I _ { 1 } I _ { 2 } } { 4 \pi }$ , attractive
• C. $\frac { \mu _ { 0 } I _ { 1 } I _ { 2 } } { 4 \pi }$ , repulsive
• D. $\frac { \mu _ { 0 } \mathrm { I } _ { 1 } \mathrm { I } _ { 2 } } { 4 \pi \mathrm { a } }$ , repulsive

Answer 1

Answer: (B)

$\frac { \mu _ { 0 } I _ { 1 } I _ { 2 } } { 4 \pi }$ , attractive

Answer 2

F₂ & F₄ cancel each other, F₁ > F₃ F_net= F₁ – F₃

= .a – a

=