ROSHAN MUJEEB
Last Activity: 4 Years ago
orque due to the magnetic fieldτmag=μ×B
Let the wire loop be in xy plane.
Letμ=μk^
B=B0(−i^)
∴τ=μk^×B(−i^)=μB(−j^)=IAB0(−j^)
Torque due to the weight mg isτmg=mgR where R is the radius of the circle.
If the loop does not tilt both the torques need to balance each other.
∴IAB0=mgR
⇒I=AB0mgR=πR2B0mgR=πRB0mg