Q1
A current-carrying wire produces a:
Amagnetic field
Bsound wave
Clight wave
Dchemical reaction
CBSEClass 8 (CBSE)ScienceCh 4 · Topic 1
Magnetic Effect of Electric Current
Learning that an electric current produces a magnetic field.
Core concept
An electromagnet is created by wrapping an insulated wire coil around an iron core; when current flows through the coil, the iron core becomes strongly magnetised, but loses its magnetism when the current stops — making electromagnets 'switchable' magnets, unlike permanent magnets. Electromagnets are widely used in devices like electric bells, cranes for lifting heavy scrap metal, and electric motors, since their strength can be controlled by adjusting the current or the number of coil turns.
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• A current-carrying wire produces a magnetic field around it (Oersted's discovery, 1820).
• An electromagnet is made by wrapping wire around an iron core; current makes it magnetic.
• Electromagnets lose magnetism when current stops, unlike permanent magnets.
• Uses: electric bells, cranes, electric motors.