An electric current is flowing in a long straight wire. The magnetic field due to this current a distance of 5 cm from the wire is 10 T. The magnetic field at a distance of 10 cm from the wire is

2.5 T

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5 T

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20 T

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40 T

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Solution

The correct option is B
5 T

$B \propto \frac{1}{r} {∵ B = \frac{μ_{0} I}{2 π r}} \Rightarrow B = 5 T$

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An electric current is flowing in a long straight wire. The magnetic field due to this current a distance of 5 cm from the wire is 10 T. The magnetic field at a distance of 10 cm from the wire is

The correct option is B 5 T B∝1r{∵B=μ0I2πr}⇒B=5 T

The correct option is B
5 T

$B \propto \frac{1}{r} {∵ B = \frac{μ_{0} I}{2 π r}} \Rightarrow B = 5 T$