What is the loop's equilibrium orientation?

A small bar magnet experiences a 0.020 N m torque when the axis of the magnet is at 45° to a 0.10 T magnetic field. What is the magnitude of its magnetic dipole moment?

What is the magnitude of the torque on the current loop in FIGURE EX29.39?

(II) An iron atom has a magnetic dipole moment of about 1.8 x 10^-23 A m². (a) Determine the dipole moment of an iron bar 15 cm long, 1.2 cm wide, and 1.0 cm thick, if it is 100 percent saturated. (b) What torque would be exerted on this bar when placed in a 0.80-T field acting at right angles to the bar?

A motor run by a 9.0-V battery has a 20-turn square coil with sides of length 5.0 cm and total resistance 24 Ω . When spinning, the magnetic field felt by the wire in the coil is 0.020 T. What is the maximum torque on the motor?

If the restoring spring of a galvanometer weakens by 15% over the years, what current will give full-scale deflection if it originally required 25μA?

A galvanometer needle deflects full scale for a 63.0-μA current. What current will give full-scale deflection if the magnetic field weakens to 0.700 of its original value?