# 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

Explanation
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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

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