Physics

In an electromagnetic wave the electric field is given as $E=E_{0}sin\left(\omega t-kz\right)\widehat{i}$  the corresponding magnetic field will be

In AC circuit with source voltage e = 20 sin 1000 t is connected to series L – R circuit whose power factor is $\frac{1}{\sqrt[]{2}}$ . If E = 25 sin 2000 t, the new power factor is

Find the temperature of H₂ gas at which its rms speed is equal to that of O₂ at 47°C.

In an electric transformer, 220 V is applied on primary coil having number of turn 100. Find output current through 3 W resistance if number of secondary turn is 10.

If the area of cross-section is halved and length of wire having young's modulus Y is doubled, then its young's modulus will become

A long wire carrying current $\sqrt[]{2}$ A is placed in uniform magnetic field of 3 * 10^–5 T. If magnetic field is perpendicular to wire, find the magnetic force on unit length of wire.

Maximum wavelength of light source such that photoelectron can be ejected from material of work function 3 eV is

Potential due to electric dipole on axial position at distance r from dipole is proportional to (assume r >> length of dipole)

Ball released from height 10 m strikes ground and rebounds height 5 m. Find impulse imparted by ground while collision, given mass of ball is 100 g. (Take g = 10 m/s²)

Find current through zener diode if its breakdown voltage is 5V.