4.) A copper wire of length 903.2 m and cross-sectional radius 0.25 mm is wrapped around and around so that it assumes the shape of a circular coil of radius 25 cm. The coil is subject to a magnetic field with a constant magnitude of 0.25 T and a constant direction. Finally, a mechanical torque rotates this coil with a period of 25 ms/cycle. The resistivity of copper is 1.69108 .m. (a) Calculate the linear frequency and the angular frequency of the coil. (b) Calculate the number of turns of the coil. (c) Calculate the resistance of the coil. (d) The magnetic flux through this coil is alternating. Calculate its amplitude (its maximum value). (e) The induced voltage around this coil is alternating. Calculate its amplitude (its maximum value). (f) The induced current in this coil is alternating. Calculate its amplitude (its maximum value).