A particle of charge q and mass m, moves in a circular orbit of radius r, with angular speed $\omega \backslash omega$. The ratio of the magnitude of its magnetic moment, to that of its angular momentum, is given by

A conductor, of length ‘$\mathrm{\ell }\backslash ell$’, is placed normally to a horizontal uniform magnetic field B. When a certain amount of charge is suddenly passed through it is found to jump to a height ‘h’. The amount of charge that passed through the conductor is

A charged particle is accelerated through a potential difference of 12 kV and acquires a speed of $10^{6}10^6$ m/s. It is then injected perpendicularly into a magnetic field of strength 0.2 T. The radius of circle would be

A galvanometer is sensitive if it shows as large a deflection as possible when a very small current is passed through it. To achieve improved sensitivity of the galvanometer, the manufacturers prefer to

Angle of dip at a place is $30^{\circ }30^\backslash circ$. If the verticle component of earth’s magnetic field at that place is $(0.16\sqrt{3})\times 10^{-4}T(0.16\backslash sqrt3)\backslash times10^\{-4\}T$ , the value of the horizontal component would be

At the magnetic poles, earth’s total magnetic field is

For a partical plane, other than the magnetic meridian , i.e., a vertical plane at some angle $\theta \backslash theta$, with the magnetic meridian,

An iron rod 0.2m long, 10 mm in diameter and of permeability $10^{3}10^3$, is placed inside a long solenoid wound with 300 turns/meter. If a current of 0.5A is passed through the rod, total magnetic moment of the rod would be (nearly)

The resistance of a pivoted type galvanometer is $8\mathrm{\Omega }8\backslash Omega$ and the current for full-scale deflection on it is 0.01A. This galvanometer is to be converted into an ammeter of 5A range. The only shunt available is $0.02\mathrm{\Omega }0.02\backslash Omega$. The resistance, that needs to be connected in series with the galvanometer coil, is

A loop of irregular shape carrying current is located in a external magnetic field.if wire is flexible it will take shape of