Physics Past Questions and Answers

An electric motor converts

A 15 \(\mu F\) capacitor is connected to a 240V, 50Hz ac. source. Calculate the reactance of the capacitance [\(\pi = 3.142\)]

Two identical charges situated 20cm apart in vacuum repel each other with a force of 1.0N.Calculate the value of each other with a force of 1.0N. Calculate the value of each charge. [(14 \(\pi \varepsilon_o)^{-1}\) = 9 x 10<sup style='font-size: smaller;'>9</sup>Nm<sup style='font-size: smaller;'>2</sup>C<sup style='font-size: smaller;'>-2</sup>]

In the circuit diagram above, E is a battery of negligible internal resistance. If its emf is 9.0V. Calculate the current in the circuit ``

A wire of length 100 cm has a resistance of 10\(\Omega\). If its cross-sectional area is 0.005cm<sup style='font-size: smaller;'>2</sup>, determine its resistivity