The orientation of small satellite is often controlled using torque from current carrying coil in earth's magnetic field. Suppose a multiturn coil has a cross-sectional area of , dissipates 0.2 w of electrical power from a 5V power supply and provides a magnetic moment of 0.02Am2 .
(a) Find coil current
(b) calculate number of turns in the coil
(c) calculate maximum magnitude of torque if earth's magnetic field has magnitude
