Two parallel wires carry equal amounts of current into the page as shown. What is the direction of the magnetic field at point $N?$

A square loop of radius $3$ cm and resistance $10$ is in a region of time$-$dependent $B-$field $B(t)=4(1-0\mathrm{.}2t).$

All quantities in SI units.

a: Determine the time$-$dependent expression for the magnetic flux

b: Sketch a graph of the magnetic flux vs time.

c: Determine the magnitude and direction of the induced current.

d: Calculate the energy dissipated from $t=0$ to $4$ second.

Focus