Physics Test - ...

The Bohr model of atoms,

A solenoid of inductance \(L\) and resistance \(R\) is connected to a battery. The time taken for the magnetic energy to reach \(\frac{1}{4}\) of its maximum value is:

Which of the following setups can be used to verify Ohm's law?

Calculate the change in capacity on introduction of dielectric. if a dielectric slab of thickness \(1.0 {~cm}\) and dielectric constant 5 is placed between the plates of a parallel plate capacitor of plate area \(0.01 {~m}^{2}\) and separation \(2.0 {~cm}\).

Four identical particles of mass \(M\) are located at the corners of a square of side '\(a\)'. What should be their speed if each of them revolves under the influence of others' gravitational field in a circular orbit circumscribing the square?

The vertical component of the earth's magnetic field is \(6 \times 10^{-5} \mathrm{~T}\) at any place where the angle of dip is \(37^{\circ}\). The earth's resultant magnetic field at that place will be \(\left(\right.\) Given \(\left.\tan 37^{\circ}=\frac{3}{4}\right)\)

The total path length is always __________ to the magnitude of the displacement vector of a particle.

Which of the equation is dimensionally correct. Where (f = focal length, u = image distance, v = object distance)

Two photons of same frequency are produced due to the annhiliation of a proton and antiproton. Wave length of the proton so produced is: