A transformer has \( N_p = 700 \), \( N_s = 350 \). If \( V_p = 280 \, \text{V} \) (rms), what is the secondary voltage?
**Transformer** works on mutual induction, V_s/V_p = N_s/N_p, I_s/I_p = N_p/N_s for ideal (power conserved V_p I_p = V_s I_s), step-up N_s>N_p V_s>V_p I_s
Ref: NCERT > Physics Book > Alternating Currents > Transformer, AC Generator and LC Oscillations