Question

In a step up transformer:

(a) N_S = N_P 

(b) N_S < N_P

(c) N_S > N_P 

(d) nothing can be said

Answer 1

N_S > N_P

Hint: Since a step-up transformer is used to change a low voltage alternating e.m.f. to a high voltage alternating e.m.f. of same frequency, the number of turns in the secondary coil is more than the number of turns in the primary coil, i.e. N_S > N_P