2010 - WAEC Physics Past Questions and Answers - page 5
Which of the following factors will increase the sensitivity of moving coil meter?
In order to prevent bar magnets from losing their strength, they are stored wih keepers such that the two bars are placed with
The energy, E stored in an inductor of inductance L when current I passes through it is given by the equation
The resonant frequency of an a.c circuit is 1000 kHz. If each of the capacitance and inductance in the circuit is reduced by 50%, and no other changes are made, the resonant frequency will become
Eddy currents can be reduced by
an electron moves with a speed of 2.0 x 106ms-1 in a straight line. Calculate the wave length of the electron wave. [mass of an electron = 9.1 x 10-31 kg][Planck's constant = 6.6 x 10-34Js]
Oxidation of the filament in a light bulb is prevented by the introduction of
In a cathode ray tube, the function of the x-plates is to
A nuclide represented as (^{70}_{32}X) has a neutron-proton ratio of
Neutrons are used to induce artificial radioactivity because they