what is the basic cause of induced EMF
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For a stationary conductor the EMF is caused entirely by electric fields. What happens is there are always electric fields when magnetic fields change. The induced electric fields and the changing magnetic fields have a common cause.
For a moving conductor in an unchanging magnetic field, the EMF is caused by the magnetic field exerting a force on moving charges.
For a moving conductor in a changing magnetic field, the EMF is caused by both electric and magnetic forces.
For your examples you need to look at whether things are moving and whether fields are changing. And whatever causes those things are ultimately responsible. I hope this can help u
For a moving conductor in an unchanging magnetic field, the EMF is caused by the magnetic field exerting a force on moving charges.
For a moving conductor in a changing magnetic field, the EMF is caused by both electric and magnetic forces.
For your examples you need to look at whether things are moving and whether fields are changing. And whatever causes those things are ultimately responsible. I hope this can help u
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