JAMB Physics Past Questions & Answers - Page 167

If the frequency of the e.m.f. source in the a.c. circuit illustrated above is $\frac{500}{\pi}$Hz. What is the reactance of the inductor?

A particle of charge q and mass m moving with a velocity v enters a uniform magnetic field b in the direction of the field. The force on the particle is

In which of the following is a stationary wave produced?

i. A vibrating turning fork held near the end of a resonance tube closed at one end.
ii. A string tightly stretched between two points and plucked at its middle.
iii. The tuning fork vibrating in air

A man standing 300m away from the wall sounds a whistle. The echo from the wall reaches him 1.8sec. later, calculate the velocity of sound in air

Which of the following statements is true of the diagram shown above?