153229 A non-conducting disc of radius $R$ has surface charge density which varies with distance from the centre as $\sigma(r)=\sigma_{0}\left[1+\sqrt{\frac{r}{R}}\right]$, where $\sigma_{0}$ is a constant. The disc rotates about its axis with angular velocity $\omega$. If $B$ is the magnitude of magnetic induction at the centre, then $\frac{B}{\mu_{0} \sigma_{0} \omega R}$ will be

153231 A unit negative charge with mass $M$ resides at the mid-point of the straight line of length $2 a$ adjoining two fixed charges of magnitude $+Q$ each. If it is given a very small displacement $x(x$ $\lta$ ) in a direction perpendicular to the straight line, it will

153233 The magnetic induction at the centre of a current carrying circular coil of radius $8 \mathrm{~cm}$ is $6 \sqrt{6}$ times the magnetic induction at a point on its axis. Then the distance of the point from the centre of the coil in $\mathrm{cm}$ is $(\sqrt{5}=\mathbf{2 . 2 3 6})$

153235 Consider a metal ball of radius ' $r$ ' moving at a constant velocity ' $v$ ' in a uniform magnetic field of induction $\vec{B}$. Assuming that the direction of velocity forms an angle ' $\alpha$ ' with the direction of $\vec{B}$, the maximum potential difference between points on the ball is

153229 A non-conducting disc of radius $R$ has surface charge density which varies with distance from the centre as $\sigma(r)=\sigma_{0}\left[1+\sqrt{\frac{r}{R}}\right]$, where $\sigma_{0}$ is a constant. The disc rotates about its axis with angular velocity $\omega$. If $B$ is the magnitude of magnetic induction at the centre, then $\frac{B}{\mu_{0} \sigma_{0} \omega R}$ will be

153231 A unit negative charge with mass $M$ resides at the mid-point of the straight line of length $2 a$ adjoining two fixed charges of magnitude $+Q$ each. If it is given a very small displacement $x(x$ $\lta$ ) in a direction perpendicular to the straight line, it will

153233 The magnetic induction at the centre of a current carrying circular coil of radius $8 \mathrm{~cm}$ is $6 \sqrt{6}$ times the magnetic induction at a point on its axis. Then the distance of the point from the centre of the coil in $\mathrm{cm}$ is $(\sqrt{5}=\mathbf{2 . 2 3 6})$

153235 Consider a metal ball of radius ' $r$ ' moving at a constant velocity ' $v$ ' in a uniform magnetic field of induction $\vec{B}$. Assuming that the direction of velocity forms an angle ' $\alpha$ ' with the direction of $\vec{B}$, the maximum potential difference between points on the ball is

153229 A non-conducting disc of radius $R$ has surface charge density which varies with distance from the centre as $\sigma(r)=\sigma_{0}\left[1+\sqrt{\frac{r}{R}}\right]$, where $\sigma_{0}$ is a constant. The disc rotates about its axis with angular velocity $\omega$. If $B$ is the magnitude of magnetic induction at the centre, then $\frac{B}{\mu_{0} \sigma_{0} \omega R}$ will be

153231 A unit negative charge with mass $M$ resides at the mid-point of the straight line of length $2 a$ adjoining two fixed charges of magnitude $+Q$ each. If it is given a very small displacement $x(x$ $\lta$ ) in a direction perpendicular to the straight line, it will

153233 The magnetic induction at the centre of a current carrying circular coil of radius $8 \mathrm{~cm}$ is $6 \sqrt{6}$ times the magnetic induction at a point on its axis. Then the distance of the point from the centre of the coil in $\mathrm{cm}$ is $(\sqrt{5}=\mathbf{2 . 2 3 6})$

153235 Consider a metal ball of radius ' $r$ ' moving at a constant velocity ' $v$ ' in a uniform magnetic field of induction $\vec{B}$. Assuming that the direction of velocity forms an angle ' $\alpha$ ' with the direction of $\vec{B}$, the maximum potential difference between points on the ball is

153229 A non-conducting disc of radius $R$ has surface charge density which varies with distance from the centre as $\sigma(r)=\sigma_{0}\left[1+\sqrt{\frac{r}{R}}\right]$, where $\sigma_{0}$ is a constant. The disc rotates about its axis with angular velocity $\omega$. If $B$ is the magnitude of magnetic induction at the centre, then $\frac{B}{\mu_{0} \sigma_{0} \omega R}$ will be

153231 A unit negative charge with mass $M$ resides at the mid-point of the straight line of length $2 a$ adjoining two fixed charges of magnitude $+Q$ each. If it is given a very small displacement $x(x$ $\lta$ ) in a direction perpendicular to the straight line, it will

153233 The magnetic induction at the centre of a current carrying circular coil of radius $8 \mathrm{~cm}$ is $6 \sqrt{6}$ times the magnetic induction at a point on its axis. Then the distance of the point from the centre of the coil in $\mathrm{cm}$ is $(\sqrt{5}=\mathbf{2 . 2 3 6})$

153235 Consider a metal ball of radius ' $r$ ' moving at a constant velocity ' $v$ ' in a uniform magnetic field of induction $\vec{B}$. Assuming that the direction of velocity forms an angle ' $\alpha$ ' with the direction of $\vec{B}$, the maximum potential difference between points on the ball is