Origin of Magnetic Field

Q.

What do you know about the discovery of magnets?

Q. Dimensional formula for intensity of magnetising field and magnetic susceptibility are.

1. $\left[M^{0}A{L}^{-1}{T}^0\right]\left[M^0{A}^0{L}^0{T}^0\right]$
2. $\left[M^0{A}^2{L}^{-1}{T}^2\right]\left[M^{0}AL{T}^{-1}\right]$
3. $\left[M^0{A}^1{L}^{-1}{T}^2\right]\left[M^0{A}^0{L}^0{T}^0\right]$
4. $\left[ML{T}^{-2}\right]\left[M{L}^2{T}^{-2}\right]$

Q.

An observation which cannot be explained by science is called____________________

Q. An electron is revolving around a proton in a circular orbit of radius $\frac{1}{2}{A}^{\circ }$. If it produces a magnetic field of 14 T, its angular velocity in rad/s

1. $4\times {10}^{16}$
2. $4\times {10}^{-15}$
3. $4\times {10}^{17}$
4. $4\times {10}^{18}$