A current of I ampere flows along an infinitely long straight thin walled hollow metallic cylinder of radius r. The magnetic field at any point outside the cylinder at a distance x form the axis is

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Solution

The correct option is A

According to Ampere's Circuital Law $\oint \to B . \to d l = μ_{0} I \Rightarrow B (2 π x) = μ_{0} I \Rightarrow B = \frac{μ_{0} I}{2 π x}$

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A current of I ampere flows along an infinitely long straight thin walled hollow metallic cylinder of radius r. The magnetic field at any point outside the cylinder at a distance x form the axis is

The correct option is A According to Ampere's Circuital Law ∮→B.→dl=μ0I⇒B(2πx)=μ0I⇒B=μ0I2πx

The correct option is A

According to Ampere's Circuital Law $\oint \to B . \to d l = μ_{0} I \Rightarrow B (2 π x) = μ_{0} I \Rightarrow B = \frac{μ_{0} I}{2 π x}$