Arectangular loop consists of 80 turns, each carrying a current 8 a. the uniform magnetic field of 40 mtis directed to the right along x-axis. the loop can turn about y-axis. ifθ=30°, a = 0.4 m, b = 0.3 m, andi = 8a, what is the magnitude of the torque exerted on the loop?

Magnetic moment of loop is given by the formula

now magnetic field is given here

Now the torque on the loop is given by

so above is the torque on the loop.

laticia draws the diagram below to show earth’s magnetic field.

answer

the arrows to the right of earth should point up.

3. dark matter

empty space could also be a simple vacuum