Physics 2007 JAMB Past Questions

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The fundamental frequency of a plucked wire under a tension of 400N is 250Hz. When the frequency is changed to 500 Hz at constant length, the tension is

A. 1600N
B. 400N
C. 160N
D. 40N

View Answer & Discuss (10) JAMB 2007

Three cells each of e.m.f 1.5 V and internal resistance 2.5Ω are connected as shown in the diagram above. Find the net e.m.f and the internal resistance

A. 1.5V, 7.50Ω
B. 1,5V, 0.83Ω
C. 4.5V, 7.50Ω
D. 4.5V, 0.83Ω

View Answer & Discuss (8) JAMB 2007

In the diagram above , if the magnetic field points into the paper and the force on a current - carrying conductor points upwards, what is the direction of the current?

A. Upwards
B. Downwards
C. Right
D. Left

View Answer & Discuss (24) JAMB 2007

The instantaneous value of the induced e.m.f as a function of time is ε = ε_o sin ωt where ε_o is the peak value of the e.m.f. The instantaneous value of the e.m.f., one quarter of the period is