A long wire is known to have a radius greater than 4.0 mm and to carry a current that is uniformly distributed over its cross section. The magnitude of the magnetic field due to that current is 0.28 mT at a point 4.0 mm from the axis of the wire, and 0.20 mT at a point 10 mm from the axis of the wire.What is the radius of the wire?
PHYSICS 2401 WEEK 6 Stored Energy Continued U e= (1/2)*C*V = (1/2)*Q /C = (1/2)*Q*V C = capacitance V = voltage Q = charge U e= potential energy Stored in electric field 2 2 2 2 (1/2)*C*V = (1/2)*(ε*A/d)*(E *d ) = (1/2)*ε*E *A*d Energy...