Question

9. Is the magnetic field strength in FIGURE Q30.9 increasing, decreasing, or steady? Explain.

Short answer

The magnetic field shown in the figure is increasing.

Step-by-step solution

Step 1. Introduction

Figure shows that the magnetic field is out of the paper and the induced electric field is clockwise.

Since the induced electric field is clockwise, the magnetic field induced by the induced electric field will be into the plane of paper.

Step 2. Explanation

Now, according to Lenz's law, the induced field should oppose the cause of induction. In this case the cause of induction is changing magnetic field. So, a magnetic field which is into the plane of paper can oppose if the original magnetic field which is out of the plane of paper is increasing.

Conclusion:

Hence, the magnetic field shown in the figure is increasing.