Some question asked earlier by students

1. TWO IDENTICAL CONDUCTING SPHERES ‘A’ & ‘B’ CARRY EQUAL CHARGES. THEY ARE INITIALLY SEPARATED BY A DISTANCE MUCH  LARGER THAN THEIR DIAMETERS AND THE FORCE BETWEEN THEM IS ‘F’. A THIRD IDENTICAL CONDUCTING SPHERE ‘C’ IS UNCHARGED. SPHERE ‘C’ IS FIRST TOUCHED TO ‘A’ AND THEN TOUCHED TO ‘B’ AND THEN REMOVED. AS A RESULT, WHAT IS THE FORCE BETWEEN ‘A’ AND ‘B’ ?
2. WHEN 20j OF WORK IS DONE ON A GAS,40j OF HEAT ENERGY IS RELEASED.IF THE INITIAL INTERNAL ENERGY OF THE GAS WAS 70j.WHAT IS THE FINAL INTRENAL ENERGY?
3. the graph for total energy stored in capacitor versis capacitance comes out to be rectangular hyperbola:
which of the two, charge on the capacitor or potential used to charge it is kept constant for this graph
4. Wat does stereopsis mean?

Author: physicsfundamentals

1. SANDEEP says:

Originally F= CQQ
= 0:088 N, where C is a constant. When sphere 3 touches 1 the
charge on both becomes Q/2. When sphere 3 the touches sphere 2 the charge on each becomes
(Q + Q/2)/2 = 3Q/4. The force between sphere 1 and 2 is then
F = C(Q/2)(3Q/4) = (3/8)CQQ
= (3/8)F = 0:033N:

2. Vishnu says:

1.)Force become one fourth.
2.)50 J
4.)Stereopsis is the ability or property or process of perceiving depth.This phenomenon arises due to different position of both eyes.One will lose this ability when he lose the sight if one eye.Try this experiment:
○ Tell your friend to hold an open pen vertically.
○ You keep the cap of pen with you.
○ Close both eyes and ask friend to change the position of pen.( Skipping this step may result in failure of experiment since the position of pen may persist in your memory )
○ Open only one eye.
○ Try to recap the pen.

You will find it difficult to recap the pen since u lost your Stereopsis.