Using Biot-Savart law to find the magnitude of the magnetic field at the centre of a current carrying circular loop. 

 (ans in pdf please)

60 A current is supplied in a long and straight wire P is a point at a distance of 40 cm from the wire. Then the wire is bended to a circular coil of radius of 40 cm the center of which is Q.

Calculate the magnitude of the magnetic field at point p

Imagine that in part E8, you had placed the compass due East of the wire. Draw two vector diagrams of the magnetic field felt by this compass: One with the current OFF and one with the current ON. Each diagram should show the magnetic fields from any relevant sources as well as a vector indiacating the total magnetic field. For this problem, assume that the current flows upwards (in diagram it is out of page).

) Two parallel wires 20 cm apart carry currents in opposite directions of 10 A. Is
there a force acting on the wires and when this is the case what is the direction of the
force? Is there a point on the connecting line between the two wires where the
magnetic field is zero and when this is so, where is that point.