I need proper answers for the following ( well explained and understandable writing) 1) A hollow copper...

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Physics

I need proper answers for the following ( well explained andunderstandable writing)

1) A hollow copper tube carries a current along its length. Whyis B =0 inside the tube? Is B nonzero outside thetube?

2)  Why does hitting a magnet with a hammer cause themagnetism to be reduced

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