Physics Past Questions and Answers

An astronomical telescope has objectives and eye-piece lenses of focal length 3.5m and 5cm respectively. Determine the magnifying power of the telescope when in normal adjustment

An aluminium cable of diameter 4 x 10<sup style='font-size: smaller;'>-3</sup>m and resistivity 3.0 x 10<sup style='font-size: smaller;'>-8</sup>\(\omega\)m has a resistance of 21\(\Omega\). Calculate the length of the cable. (\(\pi = 3.14\))

The electricity meters in houses measure energy unit consumed in

A man and his friend have masses 70kg and 60kg respectively. If they are seated 1.0m apart, calculate the gravitational force of attraction between them. (G = 6.67 x 10<sup style='font-size: smaller;'>-11</sup> Nm<sup style='font-size: smaller;'>2</sup> kg<sup style='font-size: smaller;'>-2</sup>)

The p.d across a parallel-plate capacitor is 10<sup style='font-size: smaller;'>3</sup>V. If the distance between the two plates is 10cm. Calculate the magnitude of the electric field strength between the plates.