Physics WAEC Past Questions

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366

The diagram above illustrates the conversion of a galvanometer of resistance 29 to an ammeter. The galvanometer gives a full-scale deflection for a current of 10mA. Calculate the value of R.

A. 2.0 x 10³ Ω
B. 2.0 x 10² Ω
C. 2.0 x 10^-1 Ω
D. 2.0 x 10^-2 Ω
E. 2.0 x 10^-3 Ω

View Answer & Discuss (6) WAEC 1996

367

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

368

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

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369

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