Physics Past Questions and Answers

Calculate the electric potential at a distance of 20.0cm from a point charge of 0.015C placed in air of permittivity (Take 1/4Ï€Îµ_o as 9.0 x 10⁹ Nm²C²)

A 3.40x10⁶V
B 6.75x10⁵V
C 6.75x10¹²V
D 3.40x10⁵V
E 8.30 x 10²V

Question 452:

Calculate the inductive reactance of the circuit shown above.

A 50.00
B 5.00
C 0.50
D 0.05
E 0.02

Question 453:

If the current in the resistor R in diagram above is 0.05A, calculate the p.d. across the inductor.

A 2.5V
B 25.0V
C 49.0V
D 50.0V
E 250.0V

Question 454:

A capacitor of capacitance 25Î¼F is connected to an a.c. power source of frequency 200 Hz. Calculate the reactance of the capacitor

A 0.01
B 0.02
C 50.00
D 100.00
E 200.00.

Question 455:

The energy stored in a capacitor of capacitance 5Î¼F is 40J. Calculate the voltage applied across its terminals?

A 4000V
B 200V
C 16V
D 6V
E 4V