Physics 1981 JAMB Past Questions

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A closed coil of wire is placed near a magnet. The magnet lies along the axis of the coil. Under which of the following conditions would there be no current in the coil?

A. When the coil is moved toward the stationary magnet
B. When the coil is moved away from the stationary magnet
C. when the coil is held stationary but the magnet is moved towards the coil
D. when both the coil and the magnet are held stationary
E. when the coil is held stationary but the magnet is moved away from the cell

View Answer & Discuss (4) JAMB 1981

If I is the current passing through a metallic resistor and H is the rate of Heat generated in the resistor at a constant temperature, then

A. H \(\alpha\) \(\frac{1}{I}\)
B. H \(\alpha\) \(\frac{1}{I^2}\)
C. H \(\alpha\) \(\sqrt1\)
D. H \(\alpha\) I²
E. none of the above

View Answer & Discuss (7) JAMB 1981

A solid weighs 4.8g in air, 2.8g in water and 3.2g in kerosine. The ratio of density of the solid to that of the kerosine is

A. 12
B. 3
C. 2
D. \(\frac{3}{2}\)
E. \(\frac{5}{4}\)

View Answer & Discuss (10) JAMB 1981

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A body of mass 6kg rests on an inclined plane. The normal reaction is R, and the limiting frictional force is F as shown in the image above. if F = 30N, and g = 10ms\(^{-2}\) then the angle of inclination \( \theta \) is