Post Utme Physics Past Questions and Answers

Question 561:

An inductor, \(\mathrm{L}=75 \mathrm{mH}\) is connected in series to a source of alternating emf of rms value \(250 \mathrm{~V}\) and frequency \(50 \mathrm{~Hz}\). What is the rms value of the current?

A. \(21.22 \mathrm{~A}\)
B. \(1.69 \mathrm{~A}\)
C. \(10.46 \mathrm{~A}\)
D. \(5.31 \mathrm{~A}\)
E. \(26.53 \mathrm{~A}\)

Question 562:

A series RLC circuit consists of a \(75 \Omega\) resistor, a \(5.0\) ff capacitor and \(a 75 \mathrm{mH}\) inductor. They are connected across a generator of frequency \(250 \mathrm{~Hz}\) with a rms voltage of \(12 \mathrm{~V}\). Determine the impedance of the circuit.

A. \(127.32 \Omega\)
B. \(117.8 \Omega\)
C. \(84.51 \Omega\)
D. \(74.39 \Omega\)
E. \(75.6 \Omega\)

Question 563:

A circuit consists of a \(220.0 \Omega\) resistor and a 0.5II inductor connected across a generator that has a frequency of \(120 \mathrm{~Hz}\) and \(a\) voltage if \(230 \mathrm{~V}\). Determine the phase angle between the current and the voltage

A. \(59.73^{\circ}\)
B. \(68.38^{\circ}\)
C. \(26.75^{\circ}\)
D. \(30.27^{\circ}\)
E. \(38.21^{\circ}\)

Question 564:

A \(2500 \Omega\) resistor and \(2.5 \mu \mathrm{f}\) capacitors are connected in series across a generator of \(60 \mathrm{~Hz}\) frequency and \(121 \mathrm{~V}\). Determine the power dissipated in the circuit.

A. \(2.07 \mathrm{~W}\)
B. \(2.25 \mathrm{~W}\)
C. \(4.88 \mathrm{~W}\)
D. \(4.14 \mathrm{~W}\)
E. \(45 \mathrm{~W}\)

Question 565:

A converging lens can be used a magnifying glass if the ____________

A. Object is placed at \(F\)
B. Object is placed between \(F\) and the pole
C. Object is placed at the pole
D. All of the above