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1446

Two magnets are used to magnetize a soft iron bar PQ as illustrated in the diagram given. The correct polarity at P and Q respectively

  • A. S and N
  • B. N and N
  • C. S and S
  • D. N and S
View Answer & Discuss (7) WAEC 2016
1447
In storing magnets, keepers are used to
  • A. reduced self-demagnetization
  • B. cancel the effect of the earth's magnetic field
  • C. protect the magnet from stray electric field
  • D. increase the strangth of the magnets
View Answer & Discuss WAEC 2016
1448
A 10\(\mu\)C charge moves with a velocity of 1.0 x 105 ms-1 at right angle to a uniform magnetic field of flux density 5.0 x 10-4T. Calculate the force on the charge
  • A. 5.0 x 10-5N
  • B. 5.0 x 10-4N
  • C. 5.0 x 105N
  • D. 5.0 x 106N
View Answer & Discuss (2) WAEC 2016
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1449
Which of the following statements is not correct about steel and soft iron?
  • A. steel is more magnetized than soft iron
  • B. permanent magnets are usually made of steel
  • C. soft iron is more readily magnetized than steel
  • D. soft iron more readily loses its magnetism than steel
View Answer & Discuss (4) WAEC 2016
1450
What determines the polarity at the ends of an electromagnet? The
  • A. magnitude of the current passing through the wire
  • B. material of the core of the magnet
  • C. material of the coil
  • D. direction of current in the wire
View Answer & Discuss WAEC 2016
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