Post-UTME Physics 2016 Objective — Question 20
Question 20 of 20 from the Post-UTME Screening (Post-UTME) Physics 2016 Objective paper, with the correct answer and a full explanation.
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An induced e.m.f. is obtained between the ends of a horizontal steel axle of a moving train because the
- A. steel axle moves parallel to the earth's field
- B. steel axle is a conductor
- C. earth's magnetic field has a horizontal component
- D. earth has a vertical magnetic field componentCorrect
Explanation
The vertical component of the earth's magnetic field, combined with the horizontal motion of the conducting axle, induces an emf across it.
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