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Electric Charges and Fields
Question
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The induced emf is sometimes called ‘back emf’ why?

Answer

Induced emf is also called back emf because, the induced emf opposes the change in current, due to the source of emf.

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Some More Questions From Electric Charges and Fields Chapter

a) An electrostatic field line is a continuous curve. That is, a field line cannot have sudden breaks. Why not?
b) Explain why two field lines never cross each other at any point?