i) a circular coil with radius 20 cm is placed with it's plane parallel and between two straight
wires p and q. the coil carries current i = 0.5a . i for coil is in clockwise direction when viewed
from left side. wire p is located 40 cm to the left of a circular coil and carries current i = 0.2a
while wire q is located 80 cm to the right of the circular coil and carries current l = 0.6a. both
i for p and l for q are in the same directions into the paper. determine the resultant of magnetic field at
the centre of a circular coil from the top view.
ii) if the current in wire p is out of the page, determine the resultant of magnetic field at the centre
of a circular coil.

inwards when viewing from the left side.

Explanation:

Given:

Now the magnetic field in coil will be inwards when viewed from left by the Maxwell's right hand thumb rule.

Magnitude is given by:

Now the effect of magnetic field due to wire P at the center of the loop:

(We get the effective distance as 0.4+0.2=0.6 m)

coming out of the loop when viewed from left.

Now the effect of magnetic field due to wire Q at the center of the loop:

(We get the effective distance as 0.8+0.2=1 m)

going in to the loop when viewed from left.

Now the net resultant effect all the magnetic fields:

inwards when viewing from the left side.

electrical power

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle