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Question:

why change in magnetic flux induces emf?

when we move a magnet towards a coil to which no battery is attached why emf and current are induced in it.what force is actually acting on field lines.pllllllzzzzzzz answer

Answer:

current flows to make a pole to oppose the change eg if N pole of magnet is approaching the coil , current flows to make a N pole to oppose it or if N pole of magnet is moving away the coil forms a S pole to try to attract it
You could try getting some 20 gauge wire, and cutting about 2 inch pieces (depending where you want the wheel) and make hooks on both ends. Put one end around the back of the wheel, and the other on one of the wires on the cage. :) Hope I helped! Jillian
Maybe you should take the wheel out. Put it back in, In a weeks time and she if its changed!! Otherwise maybe your hamster isnt made for wheels! Goodluck! :)
Electric Current is induced because it is a closed circuit made of a conducting material, Magnetic and Electric Fields are self sustaining in nature, they maybe closely related but the core unification of Magnetic and Electric forces lies deep within modern, or maybe undiscovered Quantum-Relativistic Electrodynamics comprehendible to only a handful of people. We can explain only the magnitude analogue of current, with the help of the principle of 'conservation of energy'

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