1.

The magnetic field strength at a point `P` distant `r` due to an infinite straight wire carrying a current `i` is as shown in the figure A. `mu_(0)`B. `mu_(0)i//2sqrt(2)r`C. `(mu_(0)i//sqrt(2)pir)`D. `(mu_(0)i)/(4pir)[2+sqrt(2)]`

Answer» `B_("net")=2(mu_(0)I)/(4pir)[sin90^(@)+sin45^(@)]o.`


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