1998 - WAEC Physics Past Questions and Answers - page 5
Calculate the resistance of the filament of lamp rated at 240V 60W
The diagram above illustrates a freely suspended bar magnet NS hanging from a point in a horizontal ceiling. The thread used for suspending the magnet and the axis of the magnet are as indicated on the diagram. The angle marked (\theta) is called the angle os
Lenz's law of electromagnet states that
A proton of charge 1.6 x 1019C is projected into a uniform magnetic field of flux density with a constant speed of 1.6 x 106ms-1, calculate the magnitude of the force exerted on it by the field
The direction of the magnetic field at a point in the vicinity of a bar magnetic is
The diagram below illustrates an a.c.source of 50V(r.m.s.), (\frac{100}{\pi})Hz connected in series with an inductor of inductor of inductance L and a resistor of resistance R. The current in the circuit is 2A and the p.d across L and R are 30V and 40V respectively. Calculate the power factor of the circuit
The diagram below illustrates an a.c.source of 50V(r.m.s.), (\frac{100}{\pi})Hz connected in series with an inductor of inductor of inductance L and a resistor of resistance R. The current in the circuit is 2A and the p.d across L and R are 30V and 40V respectively. Calculate the average power dissipated in the circuit
Use the following data to determine the length L of a wire when a fore of 30N is applied, assuming Hooke's law is obeyed
(\begin{array}{c|c}\text{Force applied/N} & 0 & 5 & 10 & 30\ \hline \text{length of wire/mm} & 500.0 & 500.0 & 501.0 & L \end{array})
Which of the following explains the concave meniscus of water in a clean glass tube? the
An electron is accelerated from rest through a potential difference of 70kV in a vacuum. Calculate the maximum speed acquired by the electron (electronic charge = -1.6 x 10-19; mass of an electron = 9.1 x 10-31kg)