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Lesson 8.4 Electromagnetic Induction

Question 4 • (OC27) Earth/Space Sci-2001310-S2-Nelson

Which of these situations would generate electrical current in a wire? Check all that apply. moving a magnet into a solenoid moving a magnet out of a solenoid holding a magnet steady inside a solenoidholding a solenoid steady outside a magnetmoving a solenoid in a magnetic field

Answer
A
moving a magnet into a solenoid
B
moving a magnet out of a solenoid
C
holding a magnet steady inside a solenoid
D
holding a solenoid steady outside a magnet
E
moving a solenoid in a magnetic field

Explanation

A current is generated when the magnetic flux through a solenoid changes. Moving a magnet into or out of a solenoid changes the magnetic field through its coils, so A and B generate current. Moving a solenoid in a magnetic field can also change the flux through it, so E applies. Holding the magnet steady inside the solenoid or holding the solenoid steady outside the magnet does not change the flux, so C and D do not generate current.

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