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PLEASEE HELP ME! PLS PLS I NEED IT NOW PLS!

PLEASEE HELP ME! PLS PLS I NEED IT NOW PLS!-example-1
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User Xia
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iron Bars form a solenoid when wrapped in a coil by a current carrying copper conducting wire .

copper coils generate a magnetic field when a current is passed through the coil . according to the helmholtz law.

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User Yessica
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