Physics Test - ...

A hollow spherical conductor of radius R is given a charge Q. Work done in moving  a charge q from its centre to surface is :

A flat car of mass M₀ starts moving to the right due to a constant horizontal force F at t = 0. Sand spills on the flat car from a stationary hopper. The velocity of loading is constant and is equal to$\mu kg{s}^{-1}$Then,

The ratio of the electrostatic force of attraction to the gravitational force between the proton and electron of the hydrogen atom is of the order of

A proton of mass m charge e is released from rest in a uniform electric field of strength E. The time taken by it to travel a distance d in the field is :

Directions: Mark the correct statements.

Two alpha particles are separated by a distance of 10⁻¹³m. The force between them in free space is :

Figure shows an electric dipole with positive charge at (0,b) and negative charge at (0,-b).

The electric potential magnitude along the x axis, from x=−a to x=a is correctly given by which graph?

A stepped cylinder, with thread wound around smaller diametre, is released from rest and the cylinder moves down. Then,

Figure shows lines of force for a system of two point charges. The possible choice for the charges is:

When a body of mass M is attached to lower end of wire (of length L) whose upper end is fixed, then the elongation of wire is l. Which of the following statements regarding this is/are correct?

Positive point charges q₁ and q₂ are moving with velocities v₁ and v₂ as shown in the given figure. Mark the correct statements.

Two identical pendulums A and B are suspended from the same point. Both are given a positive charge, with A having more charge than B. They diverge and reach equilibrium with the strings of pendulums A and B making angles θ1 and θ2 with the vertical respectively. Then:

A person connects four 1/4Ω cells in series but one cell has its terminal reversed. The external resistance is 1 Ω. If each cell has an emfof 1.5 V, the current flowing is:

Two wires of same metal have the same length but their cross-sections are in the ratio 3:1. They are joined in series. The resistance of the thicker wire is 10Ω. The total resistance of the combination is:

An electric dipole of dipole moment 'p' is kept parallel to an electric field of intensity 'E'. The work done in rotating the dipole through an angle of 90° is :