MCQ practice · SSC Physics Board questions · Chapter 12: Magnetic Effects of Current
For a step-up transformer, which of the following is correct?
- i. Vs > Vp
- ii. ns > np
- iii. Is > Ip
Think it through first, then pick an option.
- a i
- b iii
- c i and ii
- d i, ii and iii
Answer and explanation
Correct answer: c i and ii
The book: a step-up has more turns and more voltage on the secondary. The current falls, so iii is not true.
Why the other options are wrong
- a i: i is true but ii is also true: a step-up has more secondary turns, so it is left out here. iii is not true.
- b iii: iii is false: when voltage rises the current falls (V_P I_P = V_S I_S), so in a step-up I_S < I_P.
- d i, ii and iii: iii is not true: by whatever factor voltage rises, the current falls, so I_S < I_P.
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