Current Electricity — Physics STD 12 Science — Question

If the intensity of incident radiation is increased in a photoelectric cell, how will the stopping potential change?

Which part of electromagnetic spectrum is used to study crystal structures?

An electron, passing through a region is not deflected. Are you sure that there is no magnetic field in that region?

Name the electromagnetic radiations used for viewing objects through haze and fog.

Define the unit of electric potential.

The elastic limit of steel is 8 × 10⁸N/m² and its Young's modulus 2 x 10¹¹N/m². Find the maximum elongation of a half meter steel wire that can be given without exceeding the elastic limit.

What is the resultant force on an electric dipole placed in a uniform electric field?

A photographic plate placed at a distance of 5cm from a weak point source is exposed for 3s. If the plate is kept at a distance of 10cm from the source, the time needed for the same exposure is:

1. 3s
2. 12s
3. 24s
4. 48s

Find the force exerted by the water on a 2m² plane surface of a large stone placed at the bottom of a sea 500m deep. Does the force depend on the orientation of the surface?

What is the difference between a conductor and a non-conductor?