Physics for IGCSE & O level - Magnets And Currents (Section 12 - No. 4)
How is the strength of an electromagnet increased?
By using a stronger core material.
By adding more coils of wire.
By increasing the current through the coil.
By decreasing the number of coils.
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Increasing the current, the number of coils, and using a stronger core material increase the strength.