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. 

The following three impedances are connected in series across a 40 V, 20 kHz supply: a 
resistance of 8 Ω, a coil of inductance 130 μH and 5 Ω resistance, and a 10 Ω resistor in 
series with a 0.25 µF capacitor. Sketch a neat diagram representing this network, and 
calculate:
5.1.1 The inductive and capacitive reactance’s. (4)
5.1.2 The magnitude and phase angle of the circuit impedance. (4)
5.1.3 The voltage drops across resistance, inductance and capacitance.