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Electric Charges and Fields
Question
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Define one henry. 

Answer

If the rate of change of current of 1 ampere per second induces an e.m.f. of one volt in a coil then the inductance of coil is one henry. 

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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?