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191
Lenz’s law of electromagnetic induction states that
  • A. electromotive force is induced in a circuit whenever there is a change in the magnetic flux linked with the circuit
  • B. the induced current in a conductor is in such a direction as to oppose the change producing it
  • C. the induced e.m.f. in a circuit is proportional to the rate of change of number of lines of force linking the circuit
  • D. a force is exerted on a current carrying conductor in a magnetic field
  • E. the induced e.m.f. is proportional to the current producing the magnetic flux.
View Answer & Discuss WAEC 1992
192
Which of the following statements is not correct?
  • A. A magnetic Held is a region where a magnetic force can be detected.
  • B. Magnetic fields are scalar quantities.
  • C. The magnitude of the magnetic force experienced by a moving charge depends on the speed on the charge.
  • D. the angle between the direction of the earth’s magnetic held and the horizontal is called the angle of dip.
  • E. Iron filings can be used to trace out the magnetic field around a bar magnet.
View Answer & Discuss (3) WAEC 1992
193
Calculate the energy stored in 20μF capacitor if the potential difference between the plates is 40 V.
  • A. 3.2 x10-2J
  • B. 1.6x102J
  • C. 8.0x10-4J
  • D. 4.0x10-4J
  • E. 2.0x10-4J
View Answer & Discuss (1) WAEC 1992
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194
The diagrams above show lines of force in electric fields. In which of the diagrams would a positive test charge experience the least force as it moves from x to y?
  • A. I only
  • B. II only
  • C. III only
  • D. I and II only
  • E. II and III only
View Answer & Discuss (3) WAEC 1992
195

What is the electric potential at a point distance r from a proton of charge q placed in a medium of permittivity εo?

  • A. q2/4πεor2
  • B. q/4πεor2
  • C. q2/4πεor
  • D. q/4πεor
  • E. 4πεoq2r
View Answer & Discuss (2) WAEC 1992
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