In hydrogen atom, the electron is making $6.6 \times {10^{15}}\,rev/\sec $ around the nucleus in an orbit of radius $0.528\, \mathop A\limits^o $. The magnetic moment $(A - {m^2})$ will be
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A massless square loop, of wire of resistance $10\,\Omega$. supporting a mass of $1\,g$. hangs vertically with one of its sides in a uniform magnetic field of $10^3\, G$, directed outwards in the shaded region. A dc voltage $V$ is applied to the loop. For what value of V. the magnetic force will exactly balance the weight of the supporting mass of $1\,g$ ? (If sides of the loop $=10\,cm , g =10\,ms ^{-2}$ )
The ratio of the magnetic field at the centre of a current carrying circular coil to its magnetic moment is $'\alpha '.$ If the current and radius both are doubled then new ratio will become
A disc of radius $r$ and carrying positive charge $q$ is rotating with an angular speed $l$ in a uniform magnetic field $B$ about a fixed axis as shown in figure, such that angle made by axis of disc with magnetic field is $\theta $. Torque applied by axis on the disc is
When equal current is passed through two coils, equal magnetic field is produced at their centres. If the ratio of number of turns in the coils is $8: 15$, then the ratio of their radii will be
A non-planar loop of conducting wire carrying a current $I$ is placed as shown in the figure. Each of the straight sections of the loop is of length $2a$. The magnetic field due to this loop at the point $P$ $(a,0,a)$ points in the direction
Two long current carrying conductors are placed parallel to each other at a distance of $8 \,cm$ between them. The magnitude of magnetic field produced at mid-point between the two conductors due to current flowing in them is $300 \,\mu T$. The equal current flowing in the two conductors is ...............
Figure shows a square loop $ABCD$ with edge length $a$. The resistance of the wire $ABC$ is $r$ and that of $ADC$ is $2r$. The value of magnetic field at the centre of the loop assuming uniform wire is
An elastic circular wire of length $l$ carries a current $I$. It is placed in a uniform magnetic field $\mathop B\limits^ \to $ (Out of paper) such that its plane is perpendicular to the direction of $\mathop B\limits^ \to $. The wire will experience