A transformer increases an alternating e.m.f. from 220V to 880V. If primary coil has 1000 turns, the number of turns in the secondary coil are _____.

Q.1 (x) A transformer increases an alternating e.m.f. from 220V to 880V. If primary coil has 1000 turns, the number of turns in the secondary coil are _____.

A. 1000

B. 2000

C. 3000

D. 4000

Doubtly Asked 28 Oct 2026 Board exam · March 2025 hsc 12th Save WhatsApp Report

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Answer: D. 4000

Answer: (d) 4000

For a transformer \(\dfrac{e_s}{e_p} = \dfrac{N_s}{N_p}\), so \(N_s = 1000 \times \dfrac{880}{220} = 4000\) turns (a step-up transformer).

Doubtly AI · 28 Oct 2026 AI-verified · Oct 2026 Report

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A transformer increases an alternating e.m.f. from 220V to 880V. If primary coil has 1000 turns, the number of turns in the secondary coil are _____.

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