A loop of wire is placed in a perpendicular magnetic field. Suddenly, the magnitude of the magnetic field begins to increase, what is the direction of the induced current in the loop

Answer:As the bar moves upward through the constant magnet

ic field region, the area of the loop decreases, so

the flux through the loop

decreases. By Lenz's law, any induced current will

tend to oppose the decrease. Using right hand rule

we know that magnetic field

inside the loop due to a ccw current comes out of t

he plane. Therefore a ccw current will create a str

onger magnetic field inside

the loop, tending to increase the flux.