Figure shows a long wire bent at the middle to form a right angle.Show that the magnitudes of the magnetic fields at the points `Q` and `R` are unequal and find these magnitudes.The wire `w_(1)` and the circumference of circle are coplaner and `w_(2)` is perpendicular to plane of paper.Also find the ratio of field at `Q` and `R`.

Answer

A, B, D

Explanation

Magnetic field at `Q` is
`B_(Q)=(mu_(0)i)/(4pid)`
Now magnetic field at `R` is
`B_(R)=(mu_(0)i)/(4pid)sqrt2`