Teaching UP PGT Mock Test Series 2024 Physics Electromagnetic Induction and Inductance Magnetic Flux
The fractional change in the magnetic field intensity at a distance 'r' from centre on the axis of current carrying coil of radius 'a' to the magnetic field intensity at the centre of the same coil is: (Take r < a).
1
\(\frac{3}{2}\frac{{{a^2}}}{{{r^2}}}\)
2
\(\frac{2}{3}\frac{{{a^2}}}{{{r^2}}}\)
3
\(\frac{2}{3}\frac{{{r^2}}}{{{a^2}}}\)
4
\(\frac{3}{2}\frac{{{r^2}}}{{{a^2}}}\)