Simple A. C. Circuits - Jamb Physics Past Questions and Answers

Question 31:

• JAMB 2011

In an A.C circuit, the ratio of r.m.s value to peak value of current is

A. 2
B. \( \frac{1}{2} \)
C. \( \frac{1}{\sqrt{2}} \)
D. \( \sqrt{2} \)

Question 32:

• JAMB 2012

At what frequency would a 10H inductor have a reactance of 2000Ω?

A. π/200Hz
B. π/100Hz
C. 100/Ï€Hz
D. 100Ï€Hz

Question 33:

• JAMB 2012

in a series R-L-C circuit at resonance, the voltages across the resistor and the inductor are 30V and 40V respectively, what is the voltage across the capacitor?

A. 30V
B. 40V
C. 50V
D. 70V

Question 34:

• JAMB 2012

A 2H inductor has negligible resistance and is connected to a 50/Ï€ Hz A.C. Supply. The reactance of the inductor is

A. 200 Ω
B. 50 Ω
C. 100/π Ω
D. 25/π Ω

Question 35:

• JAMB 2012

The current through a resistor in an a.c circuit is given as 2 sin wt. Determine the d.c. equivalent of the current

A. A/√2
B. 2/√A
C. 2 A
D. √2 A