Post-UTME Physics 2016 Objective — Question 17
Question 17 of 20 from the Post-UTME Screening (Post-UTME) Physics 2016 Objective paper, with the correct answer and a full explanation.
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A coil having an inductance of 0.14H and a resistance of 12 ohm is connected across a 110V, 25Hz line. Determine the current in the coil.
- A. 4.4ACorrect
- B. 5.4A
- C. 2.5A
- D. 1.2A
Explanation
XL=2.pi.f.L=2x3.14x25x0.14=22 ohm. Z=sqrt(R^2+XL^2)=sqrt(144+484)=25.06 ohm. I=V/Z=110/25.06=4.4A.
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