Physics 1996 WAEC Past Questions

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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 (8) WAEC 1996

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

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 (15) WAEC 1996

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 WAEC 1996

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/(4πε_or²)
B. Q/(4πε_or²)
C. Q/(4πε_or)
D. Q²/(4πε_or²)
E. Q/(4πε_or) ²

View Answer & Discuss WAEC 1996

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Physics 1996 WAEC Past Questions

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