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Physics 1996 WAEC Past Questions

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46

A wire of length 100cm and cross-sectional area of 2.0 x 10-3cm2 has a resistance of 0.10 Ω. Calculate its electrical conductivity.

  • A. 5.0 x 107Ω-1cm-1
  • B. 5.0 x 106Ω-1cm-1
  • C. 2.0 x 106Ω-1cm-1
  • D. 5.0 x 105Ω-1cm-1
  • E. 2.0 x 106Ω-1cm-1
View Answer & Discuss (12) WAEC 1996
47
Lenz's law of electromagnetic induction states that
  • A. e.m.f. 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 magnitude of the induced e.m.f. in a circuit is proportional to the rate of change of the number of lines of force linking the circuit
  • D. a force is exerted on a current-carrying conductor in a magnetic Held
  • E. the induced charge is constant for a fixed change of flux.
View Answer & Discuss (2) WAEC 1996
48
A cell of e.m.f. 1.5V is connected in series with a resistor of resistance 39. A high-resistance voltmeter connected across the cell registers only 0.9V. Calculate the internal resistance of the cell
  • A. 1.85Ω
  • B. 2.0Ω
  • C. 2.4Ω
  • D. 4.5Ω
  • E. 5.0Ω
View Answer & Discuss (16) WAEC 1996
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49
Soft iron is used in making the armature of an electric bell because it
  • A. retains its magnetism for a longtime
  • B. Loses its magnetism readily
  • C. Produces permanent magnets
  • D. is not easily magnetised
  • E. decreases the magnetic effect of a direct current
View Answer & Discuss (1) WAEC 1996
50
The diagram above illustrates an isolated metal sphere carrying charge W in a medium whose permittivity is so. The magnitude of the electric field intensity at P can be expressed as
  • A. Q2/(4πεor2)
  • B. Q/(4πεor2)
  • C. Q/(4πεor)
  • D. Q2/(4πεor2)
  • E. Q/(4πεor) 2
View Answer & Discuss WAEC 1996
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