Rohanmade four electromagnets A, B, C, and D with 20, 40, 60 and 80 turns.
He connected them one by one to a battery of two cells and brought them near
a box of all-pins. Which electromagnet will attract the maximum pins and why?

The electromagnet with 80 no. of turns will attract the maximum pins because the strength of the electromagnet is increased by increasing the no. of turns of the coil in it.

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