Class 12th

Two coils of self inductance L₁ and L₂ are connected in series combination having mutual inductance of the coils as M. The equivalent self inductance of the combination will be:

In free space, an electromagnetic wave of 3 GHz frequency strikes over the edge of an object of size $\frac{\lambda }{100},$ where $\lambda$ is the wavelength of the wave in free space. The phenomenon, which happens there will be

A bar magnet having a magnetic moment of 2.0 * 10⁵ JT^-1, is placed along the direction of uniform magnetic field of magnitude B = 14 * 10^-5 T. The work done in rotating the magnet slowly through 60° from the direction of field is:

If Electric field intensity of a uniform plane electro magnetic wave is given as $E=-301.6sin\left(kz-\omega t\right){\widehat{a}}_x+452.4sin\left(kz-\omega t\right)\widehat{a}t\frac{V}{m}.$  

Then, magnetic intensity 'H' of this wave in Am^-1 will be:

[Given : Speed of light in vacuum c = 3 * 10⁸ ms^-1, Permeability of vacuum ${\mu }_0=4\pi *10^{-7}N{A}^{-2}$ ]

The equivalent resistance between points A and B in the given network is:

A proton and an alpha particle of the same velocity enter in a uniform magnetic field which is acting perpendicular to their direction of motion. The ratio of the radii of the circular paths described by the alpha particle and proton is

Which one of the following reactions indicates the reducing ability of hydrogen peroxide in basic medium?

Sixty four conducting drops each of radius 0.02m and each carrying a charge of $5\mu C$ are combined to form a bigger drop. The ratio of surface density of bigger drop to the smaller drop will be:

In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved?