A coil of wire that has 5 loops with a circumference of 4cm each and has an area

Question

A coil of wire that has 5 loops with a circumference of 4cm each and has an area of 1.27cm^2 is placed flat on a page. A magnetic field goes straight into the page. Why does flipping the coil over generate a current if the field is uniform and constant? Why is it a momentary clockwise induced current if the magnetic field suddenly turns off while the coil is still in the field? If an induction current is created in the coil, why is there a force of attraction between the 5 wires that make up the loops? If the field is uniform in space but is increasing in strength with time, why is the current generated in the coil going counterclockwise and not clockwise? If the coil is deformed into a square 1cm on a side but kept flat on the page, why does the magnetic flux change but the field stays the same?

Explanation / Answer

Here, induced emf = - d(phi)/dt

where, phi = magnetic flux = B.A

=> flipping the coil over generate a current because area , A of coil associated with magnetic field changes .

=> momentary clockwise induced current if the magnetic field suddenly turns off because magnetic field suddenly get eliminated so, net emf gets induced .

=>   there a force of attraction between the 5 wires that make up the loops because current is flowing in same direction in all 5 wires .

=>   the current generated in the coil going counterclockwise because according to Faraday law direction of current is such that to reduce the magnetic field .

=> the magnetic flux change but the field stays the same because magnetic flux is equal to product of magnetic field and area of coil . Here, coil is deformed so, the area changes .

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