physics ncert exemplar solutions class 12th chapter two

For a specific wavelength 670nm of light coming from a galaxy moving with velocity v, the observed wavelength is 670.7nm.

The value of v is:

Which is the correct ascending order of wavelengths?

A metallic conductor of length 1m rotates in a vertical plane parallel to east-west direction about one of its end with angular velocity 5rad s^-1. If the horizontal component of earth's magnetic field is 0.2 * 10^-4T, then emf induced between the two ends of the conductor is:

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:

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:

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:

A parallel plate capacitor with plate area A and plate separation d = 2m has a capacitance of $4\mu F.$ The new capacitance of the system if half of the space between them is filled with a dielectric material of dielectric constant K = 3 (as shown in figure) will be:

The change on capacitor of capacitance $15\mu F$ in the figure given below is: