NEET 2020 Exam Paper (180 Q) - Mock Test

An iron rod of susceptibility $599$ is subjected to a magnetising field of $1200{\text{A m}}^{-1}$. The permeability of the material of the rod is:(${\mu }_0=4\pi \times 10^{-7}{\text{T m A}}^{-1}$)

A long solenoid of $50\text{cm}$ length having $100$ turns carries a current of $2.5\text{A}$. The magnetic field at the centre of the solenoid is:(${\mu }_0=4\pi \times 10^{-7}{\text{T m A}}^{-1}$)

A charged particle having drift velocity of $7.5\times 10^{-4}{\text{m s}}^{-1}$ in an electric field of $3\times 10^{-10}{\text{V m}}^{-1}$, has a mobility in ${\text{m}}^2{\text{V}}^{-1}{\text{ s}}^{-1}$ of:

The quantities of heat required to raise the temperature of two solid copper spheres of radii $r_1$ and $r_2$ ($r_1=1.5r_2$) through $1\text{K}$ are in the ratio:

An electron is accelerated from rest through a potential difference of $V$ volt. If the de Broglie wavelength of the electron is $1.227\times 10^{-2}\text{nm}$, the potential difference is: