1.

The magnetic field vec(dB) due to a small current element vec(dl) carrying a current I at a distance vecr is given as

Answer»

`vec(DB) = (mu_0)/(4pi) I[(vec(DI) XX vec(R))/(r)]`
`vec(dB) = (mu_0)/(4pi) I^2[(vec(dl) xx vec(r))/(r)]`
`vec(dB) = (mu_0)/(4pi) I^2[(vec(dl) xx vec(r))/(r^2)]`
`vec(dB) = (mu_0)/(4pi) I[(vec(dl) xx vec(r))/(r^3)]`

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