A source of light is placed at a distance of 1m. From a photocell and the cut off potential is found to be `V_`0. If the distance is doubled what will be the cut off potential?

Electric potential at a distance 1cm from a charge is 90V. Find the charge.

Sketch a graph between frequency of incident radiations and stopping potential for a given photosensitive material. What information can be obtained from the value of the intercept of potential axis? A source of light of frequency of greater than the threshold freuency is placed at a distance of 1 m from the cathode of a photocell? the distnace of hte light sources from the cathode is reduced explain giving reasons, what change will you observe in the Stopping potential.

The potential at a certain distance from a point charge is 600 volt and the electric field is 200 NC^-1 find the distance of the point from the charge.

Three charges -q, Q and -q are placed at equal distances on a striaght line. If the potential energy of the system of three charges is zero, then what is the ratio of Q:q?

Two charges of values 50muC and 100muC are placed at a distance of 6 cm apart. Find the field and potential at a distance of 6 cm apart. Find the field and potential at a point(between two charges) 2 cm from the charge of value 50 muC .

How does the stopping potential applied to a photocell change if the distance between the light source and the cathode of the cell is doubled?

In a certain 0.1 m^3 of space, electric potential is found to be 5 V throughout. What is the electric field in this region?