# Electromagnetism – Exercise – 1

Electromagnetism » Exercise – 1

1. The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is ________. (a) 1,000 V (b) 2,000 V (c) 31.25 V (d) 3,125 V

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2. When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage ________. (a) increases (b) decreases (c) remains constant (d) reaches zero

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3. For a given wirewound core, an increase in current through the coil ________. (a) reverses the flux lines (b) decreases the flux density (c) increases the flux density (d) causes no change in flux density

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4. When the current through the coil of an electromagnet reverses, the ________. (a) direction of the magnetic field reverses (b) direction of the magnetic field remains unchanged (c) magnetic field expands (d) magnetic field collapses

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5. If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density ________. (a) increases (b) decreases (c) remains the same (d) doubles