2009 - WAEC Physics Past Questions and Answers - page 4

Sound interference is necessary to produce the phenomenon of

A satellite in circular motion around the earth does not have

When a conductor mounted on an insulating stand is charged and left for sometime, the conductor eventually loses all its charges. This is because the

An isolated metal sphere of radius R, carrying an electric charge Q, is situated in the medium of relative permitivity, E^r. A test charge is placed at a point p, distance r from the surface of the sphere. Let E^o represent the permitivity of free space. The electric potential at p is given by the expression

An isolated metal sphere of radius R, carrying an electric charge Q, is situated in the medium of relative permitivity, E_r. A test charge is placed at a point p, distance r from the surface of the sphere. Let E_o represent the permitivity of free space. The magnitude of the electric field intensity at P is given by the expression

A resistor of resistance R is connected to a battery of negligible internal resistance. If a siilar resistor is connected in series with it the

A cell of e.m.f. 1.5V is connected in series with a resistor of resistance 3.0$\mathrm{\Omega }$. A voltmeter connected across the cell registers 0.9V. Calculate the internal resistance of the cell

A wire of resistivity 4.40 x 10^-5$\mathrm{\Omega }$ cm has a cross sectional area of 7.50 x 10^-4 cm². Calculate the length of the wire that will be required to make a 4.0$\mathrm{\Omega }$ resistor

A battery of e.m.f. 12.0V and internal resistance0.5$\mathrm{\Omega }$ is connected to 1.5$\mathrm{\Omega }$ and 4.0$\mathrm{\Omega }$ series resistor. Calculate the terminal voltage of the battery.

If the direction of the curent in a straight wire is reversed, the magnetic field