The circuit below illustrates a standard resistor R, voltage source E and a lamp L connected in series. If the temperature of R is increased, the brightness of the lamp will?
A. increase sharply B. decrease slightly C. remains the same D. increase gradually Correct Answer: Option B B. decrease slightlyA transformer has 400 turns of wire in the primary coil and 40 turns in the secondary coil. If the input voltage is 150 volts. Calculate the magnitude of the output voltage
A. 150V B. 55V C. 36V D. 15V Correct Answer: Option D D. 15V Explanation ES/EP=Ns/Np=Es/150=40/400 Es = (150×40)/400 = 15VA wire of length 100 cm has a resistance of 10Ω. If its cross-sectional area is 0.005cm², determine its resistivity.
A. 0.0005Ωcm B. 0.0015Ωcm C. 0.0016Ωcm D. 0.0700Ωcm Correct Answer: Option A A. 0.0005Ωcm Explanation e = R/AL=(10×0.005)/100=0.0005In the circuit diagram below, E is a battery of negligible internal resistance. If its emf is 9.0V. Calculate the current in the circuit
A. 1.8A B. 1.0A C. 0.8A D. 0.3A Correct Answer: Option B B. 1.0A Explanation 1/r=1/r1+1/r2 = 1/5+1/20 = (4+1)/20=5/20 r = 20/5 = 4Ω R = R1 + R2 = 5 + 4 = 9Ω but V = IR I = V/R=9/9 =...Two identical charges situated 20cm apart in vacuum repel each other with a force of 1.0N. Calculate the value of each other with a force of 1.0N. Calculate the value of each charge. [(14 πεo)‾¹ = 9 x 10^9 Nm²C‾²]
A. 21μC B. 3.6μC C. 4.0μC D. 4.4μC Correct Answer: Option A A. 21μCProducts
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