A small current loop of area A=0.0008m2 and moment of inertia I=6.9e-07kgm2 carries a current i=0.0039A with its magnetic moment perpendicular to the Earth's magnetic field. The magnitude of the Earth's field is B=4.2e-05T.
a) What is the magnitude of the net torque T on the loop?
T = ____ Nm
b) What is the angular acceleration a of the loop?
a = ___ rad/s2