Physics Test - ...

Two small charged spheres A and B have charges 10 µC and 40 µC, respectively, and are held at a separation of 90 cm from each other. At what distance from A would the electric intensity be zero?

If the distance between two point charges is made 3 times,the new force on either charge will be_______.

Directions: The following question has four choices out of which ONLY ONE is correct.
three charges -q, Q, -q are placed at a equal distance on a staright line. if the total potential energy of the system is zero, then what is the ratio of Q:q ?

A parallel plate capacitor has a voltage of 5 V between the two plates separated by 4 microns (1 micron = 10^-6 m). What is the electric field between the capacitor plates?

Directions: The following question has four choices out of which ONLY ONE is correct.

Two-point charges 2x10-6C & 4x10-6C are 12 cm apart. what is the amount of work done to bring the charges 3 cm closer?

Two charges of equal magnitudes at a distance 'r' exert a force 'F' on each other. If the charges are halved and the distance between them is doubled, then the new force acting on each charge is

Two wires A and B, made of same material and having their lengths in the ratio 6 : 1 are connected in series. The potential differences across the wires are 3 V and 2V, respectively. If r_A and r_B are the radii of A and B respectively, then \(\frac{\mathrm{r}_{\mathrm{P}}}{\mathrm{r}_{\mathrm{A}}}\) is

The orbital angular momentum of a satellite revolving at a distance 'r' from the centre of Earth is 'L'. If the distance is increased to '16 r', what will be the orbital angular momentum?

The time period of a satellite of Earth is 5 hours. If the separation between Earth and the satellite is increased to 4 times the previous value, the new time period will become

In order to shift a body of mass 'm' from a circular orbit of radius '3R' to a higher orbit of radius '5R' around Earth, where 'R' is radius of Earth; the work done is: