SAT Subject Physics Practice Question 578: Answer and Explanation

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Question: 578

4. The force a magnetic field exerts on an electron is largest when the path of the electron is oriented

A. in the opposite direction from the magnetic field's direction.
B. in the same direction as the magnetic field's direction.
C. up through the magnetic field at a 45° angle.
D. down through the magnetic field at a 45° angle.
E. at a right angle to the magnetic field.

Correct Answer: E

Explanation:

The correct answer is (E). The largest force a magnetic field exerts on a moving charged particle occurs when the particle crosses the most lines of force. This occurs when the particle enters a magnetic field at right angles to the field.

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