A coil with a circular cross section having an area of 40cm2 has 40turns. When the coil is placed inside a magnetic field of 2T, the maximum torque is found to be 2x10-6 (a) Calculate the current i in the coil. (b) What work is required to rotate the coil by 180 degree, if the initial orientation of the magnetic dipole moment of the loop is at delta 0 with respect to the field B. (c)Consider two long parallel wires each carrying a current I and in the same direction as the z-axis. The wires cross the xy-plane at x = (a,0),and at x = −( a,0) . Calculate the magnetic field at a point (x y,0) in the xy− plane. One wire is at x =−a and the other at x =+a , both parallel to z-axis.
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