Jamb Physics 2003 Past Questions and Answers

Question 36:

• JAMB 2003

A circuit has an area of 0.4m² and consists of 50 loops of wire. If the loops are twisted and allowed to rotate at a constant angular velocity of 10 rad s^-1 in a uniform magnetic field of 0.4T, the amplitude of the induced voltage is

A. 8V
B. 16V
C. 20V
D. 80V

Question 37:

• JAMB 2003

The force on a charge moving with velocity v in a magnetic field B is half of the maximum force when the angle between v and B is

A. 90^o
B. 45^o
C. 30^o
D. 0^o

Question 38:

• JAMB 2003

The maximum kinetic energy of the photoelectron emitted from a metal surface is 0.34eV. If the work function of the metal surface is 1.83eV,find the stopping potential.

A. 2.17V
B. 1.49V
C. 1.09V
D. 0.34V

Question 39:

• JAMB 2003

When an alternating current given by I = 10sin (120π)t passes through a 12Ω resistor, the power dissipated in the resistor is

A. 1200W
B. 600W
C. 120W
D. 30W

Question 40:

• JAMB 2003

In a semi conductor junction diode, as the depletion or barrier layer is forward-biased, the layer

A. Widens
B. Narrows
C. Remains constant
D. Widens then narrows