Class- XII-
CBSE-Physics Electric charges and fields
CBSE NCERT Solutions for Class 12 Physics Chapter 1
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1. What is the force between two small charged sphere having charges of 2 ×10^-7C and 3 × 10^-7C placed 30 cm apart in air?
2. The electrostatic force on a small sphere of charge 0.4 µC due to another smallsphere of charge – 0.8 µC in the air is 0.2 N.
(a) What is the distance between the two spheres?
(b) What is the force on the second sphere due to the first?
3. Check that the ratio ke2/Gmemp is dimensionless. Look up a Table of Physical Constants and determine the value of this ratio. What does the ratio signify?
4. (a) Explain the meaning of the statement ‘electric charge of a body is quantized’.
(b) Why can one ignore the quantization of electric charge when dealing.
5. When a glass rod is rubbed with a silk cloth, charges appear on both. A similar
phenomenon is observed with many other pairs of bodies. Explain how this observation is consistent with the law of conservation of charge.
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