Lesson 7.5.1

7.5.1 Factors affecting induced e.m.f. Quiz: Pearson Edexcel Physics, Unit 7

20 questions

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Lesson 7.5.1, Factors affecting induced e.m.f.: 20 multiple choice questions for the Pearson Edexcel Physics (9PH0), Unit 7: Electric and Magnetic Fields, written with Revision Ninja.

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The 20 questions

  1. Which change decreases the magnitude of the induced e.m.f. in a coil moving near a magnet?

    • Adding more turns
    • Moving coil faster
    • Using stronger magnet
    • Moving coil slower

  2. According to Faraday's law, induced e.m.f. is directly proportional to which quantity?

    • Total magnetic flux
    • Rate of flux change
    • Magnetic flux density
    • Circuit resistance

  3. If the number of turns on a coil is doubled, with the same rate of change of flux through each turn, what happens to the induced e.m.f.?

    • It is unchanged
    • It doubles
    • It halves
    • It quadruples

  4. A coil is moved twice as fast past the same magnet. What happens to the induced e.m.f.?

    • It halves
    • It is unchanged
    • It quadruples
    • It doubles

  5. What determines the magnitude of e.m.f. induced in a secondary coil linked to a primary coil?

    • Primary current magnitude
    • Primary current change rate
    • Core temperature
    • Secondary coil resistance

  6. Why does pushing a magnet into a coil faster produce a larger induced e.m.f.?

    • Increased magnetic strength
    • Lower coil resistance
    • Greater total flux linkage
    • Faster flux linkage change

  7. An induced e.m.f. of 2.0 V is produced in a coil. The magnet is replaced by one of twice the field strength, and the coil is moved at half the original speed. What is the new e.m.f.?

    • 1.0 V
    • 2.0 V
    • 8.0 V
    • 4.0 V

  8. What is the magnetic flux linkage through a coil when its plane is parallel to a magnetic field?

    • Maximum value
    • N times field
    • Half of maximum
    • Zero

  9. Why is an e.m.f. induced in a coil only when entering a magnetic field?

    • Magnetic field increases
    • Current becomes zero
    • Resistance drops
    • Flux linkage changes

  10. How does doubling the turns in a coil affect the induced e.m.f. for a constant flux change rate?

    • It doubles
    • It halves
    • It stays constant
    • It quadruples

  11. A coil has an induced e.m.f. of 12 V. The number of turns is halved and the rate of change of flux per turn is doubled. What is the new e.m.f.?

    • 12 V
    • 6.0 V
    • 24 V
    • 3.0 V

  12. When a magnet passes through a coil at double speed, how does the total flux linkage change compare?

    • Unchanged
    • Quadrupled
    • Halved
    • Doubled

  13. A coil of 500 turns and area 0.0010 m^2 is removed from a uniform field of flux density 0.10 T in 0.10 s, with the field perpendicular to the coil at the start. What is the average induced e.m.f.?

    • 0.00050 V
    • 5.0 V
    • 0.050 V
    • 0.50 V

  14. What causes an e.m.f. to be induced when a magnet moves relative to a coil at constant speed?

    • Constant flux linkage
    • Changing flux linkage
    • Zero magnetic field
    • Constant resistance

  15. What is the induced e.m.f. in a coil situated in a constant, unchanging magnetic flux?

    • Zero
    • Dependent on area
    • Proportional to flux
    • Maximum value

  16. Which primary coil change produces the largest induced e.m.f. in a neighbouring secondary coil?

    • Constant high current
    • Slow current change
    • Rapid current change
    • Zero current

  17. What is the SI unit of magnetic flux linkage?

    • The volt, V
    • The henry, H
    • The weber, Wb
    • The tesla, T

  18. A 300-turn coil has the flux through each turn fall from 0.004 Wb to zero in 0.020 s. What is the average induced e.m.f.?

    • 60 V
    • 0.24 V
    • 6.0 V
    • 600 V

  19. What magnitude of e.m.f. is induced when a magnet is held stationary inside a coil?

    • Zero
    • Minimum non-zero
    • Increasing value
    • Maximum

  20. At what orientation relative to a magnetic field is the induced e.m.f. in a rotating coil greatest?

    • Plane parallel
    • At 45 degrees
    • Plane perpendicular
    • At 60 degrees

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