Question

Magnetic field at the centre of a circular coil of radius r, through which a current I flows is(A) Directly proportional tor(B) Inversely proportional to 1(C) Directly proportional to I(D) Directly proportional to I^2 WITH EXPLAINATION​

Answer 1

Answer:

c) directly proportional to l

Explanation:

according to formula

magnetic field at the center of a circular coil is :

B=µ0l/2r

so,

B ∝ I.

Answer 2

Answer:

The correct answer is option (C) Directly proportional to I.

Explanation:

The magnetic field,

$B = \frac{μ0I}{2πr}$

Where, B = magnetic field

μ0 = permeability of free space

I = electric current

r = radius

• Here, 2, π and μ0 are constant.
• The magnetic field is at the centre of a circular coil.

So, magentic field is directly proportional to current I (B ∝ I).

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