Electromagnets work by aligning little regions of magnetic field in iron so they mostly point in the same direction. This produces a greatly strengthened magnetic field. This is correct
Electromagnets' domains are aligned by the current in the coil. 17 . If a normal D-cell battery is used in a device, for every 1.0 C of charge that moves through the battery, 1.5 J of work is done on the charge.
The potential difference supplied by the battery is the work done per unit charge:
1.5 J/C. Thus, the battery does 1.5 J of work on every coulomb of charge that passes
through the battery.
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