Question

Two large metal sheets carry surface currents as shown in figure (35-E13). 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.

Answer 1

At point P,

Current i = 0

So, magnetic field B = 0

At point Q,

Applying Ampere's Law

$\int B.dl={\mu }_{0}i$

$\Rightarrow Bdl={\mu }_{0}kdl$

$\Rightarrow B={\mu }_{0}k$

At point R

Current i = 0, so, B = 0