Chapter 21, Problem 1Q

To determine

To Explain: The advantage of using coils with many turns in Faraday’s experiments.

Answer to Problem 1Q

If $N$ is large, then the induced EMF and induced current will also be large.

Explanation of Solution

Introduction:Faraday examined quantitatively about what factors influence magnitude of EMF induced. Faraday did further experiment on electromagnetic induction.

Faraday’s law of induction is the fundamental law of electromagnetism. According to this law,

  $EMF=-N\frac{\Delta {\varphi }_B}{\Delta t}$

In this equation, if $N$ is large then, the induced $EMF$ and induced current will also be large. This can be advantageous in some situations. Also, in this equation, minus sign represents the direction of induced $EMF$ .

Conclusion: When the value of $N$ is large, then both, induced EMF and current, will also, be large.