Question

Two large metal sheets carry currents as shown in figure. The current through a strip of width dl is Kdl where K is a constant. Find the magnetic field at the points P, Q and R.
Figure

Answer 1

The magnetic field at the points P and R are Zero

The magnetic field at the point Q is $B=\mu_{0} k$

Explanation:    

At point P current is (i) = 0

At point Q Magnetic field Is (B) = 0

Ampere’s law :- According to Ampere's law, magnetic fields refer to the electrical current that is generated in them. The law states the magnetic area of a given current or vice versa,, as long as there is no change in the electrical field over time.

Applying Ampere’s law, we get

$\int B . d l=\mu_{0} i$                     Hence at P and R ,B = 0

$B . d l=\mu_{0} k d l$

$B=\mu_{0} k$

At point R  Current is (i) = 0      B = 0

               

Answer 2

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please refer the above attachment