Magnetic Effects Of Current Question 126

Question: The field due to a long straight wire carrying a current I is proportional to [MP PMT 1993]

Options:

A) I

B) $ I^{3} $

C) $ \sqrt{I} $

D) $ 1/I $

Show Answer

Answer:

Correct Answer: A

Solution:

$ B=\frac{{\mu_{0}}}{4\pi }\cdot \frac{2i}{r} $

Þ $ B\propto i $