JAMB Physics 2001 Question 43

Question 43

Electromagnetic Induction

The primary coil of a transformer has N turns and is connected to a 120 V a.c power line. If the secondary coil has 1,000 turns and a terminal voltage of 1,200 volts, what is the value of N?

  1. A.120
  2. B.100
  3. C.1,000
  4. D.1,200
Show the answer and explanation

Answer: B (100)

Explanation

Np/Ns = Vp/Vs: N/1000 = 120/1200, so N = 100.