At a distance of 10 cm from a long staright wire carrying a current I, the magnetic field is 0.04 T. At a distance of 40 cm from the wire, the magnetic field will be

At a distance of 10 cm from a long staright wire carrying a current I,

1.	At a distance of 10 cm from a long staright wire carrying a current I, the magnetic field is 0.04 T. At a distance of 40 cm from the wire, the magnetic field will be
Answer» `0.01 T` `0.04 T` `0.16 T` `0.02 T` SOLUTION :Here `r_1 = 10CM = 0.1 m, r_2 = 40 CM = 0.4 m and B_1 = 0.04 T` `:. B_2 = (B_1 r_1)/(0.4) = 0.01 T`

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At a distance of 10 cm from a long staright wire carrying a current I, the magnetic field is 0.04 T. At a distance of 40 cm from the wire, the magnetic field will be

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