1.

Which of the following relations represent Biot-Savart's law?

Answer»

`d VEC(B) = (mu_(0))/(4pi) I (d vec(l) xx vec( r))/(r )`
`d vec(B)= (mu_(0))/(4pi) I (d vec(l) xx vec(r ))/(r^(2))`
`d vec(B) = (mu_(0))/(4pi) I (d vec(l) xx vec(r ))/(r^(3))`
`d vec(B) = (mu_(0))/(4pi) I (d vec(l) xx vec(r ))/(r^(4))`

Solution :Biot-Savart.s law STATES that the magnetic field `d vec(B)` due to an element `d vec(l)` carrying a steady current I at a point P at a distance r from the current element is `d vec(B) = (mu_(0))/(4pi) I (d vec(l) xx vev(r ))/(r^(3))`


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