Q. A step-up transformer is used on a 120 V line to provide a potential difference of 2400 V. If the primary coil has 75 turns, the number of turns in the secondary coil is
A) 150
B) 1200
C) 1500
D) 1575
Explanation
(c) $\frac{n_{s}}{n_{P}} = \frac{E_{s}}{E_{P}} = \frac{2400}{120} = 20\ $
$n_{s} = 20\ n_{P} = 20 \times 75 = 1500.$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.