Question

For a step-down transformer, the turns ratio is $10$. A Daniell cell of emf, $1.2\text{V}$ is connected across its primary coil. The emf across the secondary coil will be -

• A. $12\text{V}$
• B. $0.12\text{V}$
• C. $1.2\text{V}$
• D. $0\text{V}$

Answer 1

The correct option is D $0\text{V}$

Daniell cell is a DC source. So, there is almost constant magnetic flux produced in the core.

As there is no change in the magnetic flux across the core, the induced emf in the secondary coil will be zero.

Hence, option $\left(D\right)$ is the correct answer.