The magnetic field inside the current carrying wire varies
Correct answer: D. Directly with r
- A. Inversely with r
- B. Inversely with r2
- C. Directly with r2
- D. Directly with r
Explanation
To find the magnetic field at a radius r inside the wire, draw a circular loop of radius r. The magnetic field should still go in circular loops, just as it does outside the wire. So, inside the wire the magnetic field is proportional to r, while outside it's proportional to 1/r.
This question appeared on the NUMS 2022 paper, which you can sit online with every answer explained.
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About Magnetic Flux Density
Magnetic flux density measures the magnetic force acting on a current carrying conductor or moving charge in a magnetic field. Work includes the relations B equals F divided by IL and F equals qvB, the tesla as its SI unit, field direction and the distinction between flux density and magnetic flux.
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