# CBSE Class 12-science Physics Coulomb's Law

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- What is coulombs law
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- A) Two charges +4esu and +9 esu are situated at a distance of 10 cm . A unit charge is situated at a point on the line joining the charges. At what point the unit charge experiences a force which is (a) equal and opposite,(b)equal and in the same direction? B) Two conductors have resistance R1 and R2 at 0°C. Their temperature coefficients of resistances are a1 and a2 respectively. Show that the temperature coefficients of their equivalent resistances when joined in series and in parallel are respectively (R1a1+R2a2)/(R1+R2) and (R1a2+R2a1)/(R1+R2)
- A spherical ball of mass m with charge q can revolve in a vertical plane at the end of string of length l. At the centre of revolution there's a second ball with a charge identical in sign and magnitude to that of the revolving ball. What maximum horizontal velocity must be imparted to the ball in the lowest position to enable it to make a full revolution?

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