Question

an electric current passes through a long straight copper wire at a distance 5 cm from the wire ,the magnetic field is B.The magnetic field at 25cm from the straight wire would be​

Answer 1

Answer:

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Explanation:

By Ampere's circuit law, we have B(2πr)=µ0I.

In this scenario, I is the enclosed current and it remains same. Only, the radius is increased 5 times.

So, the magnetic field becomes one-fifth.

so, the answer is

$= > \frac{B}{5}$

Answer 2

Answer:

By Ampere's circuit law, we have B(2πr)=µ0I.

In this scenario, I is the enclosed current and it remains same. Only, the radius is increased 5 times.

So, the magnetic field becomes one-fifth.

so, the answer is

= > \frac{B}{5} =>

5

B