#### A long straight wire of radius a carries stead current . The current is uniformly distributed across its cross section. The ratio of the magnetic field at  Option 1) 1/2 Option 2) 1/4 Option 3) 4 Option 4) 1

As we learnt in

Magnetic field Inside the solid cylinder -

B=

- wherein

Uniform current is flowing. Current enclosed in the 1st ampèrean path is

Magnetic induction at a distance

Option 1)

1/2

Incorrect option

Option 2)

1/4

Incorrect option

Option 3)

4

Incorrect option

Option 4)

1

Correct option

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