CBSE Class 12science  Electric Field Videos
Electric Field  Part 2
This video explains the electric field due to a point charge and due to a system of charges, and the concept of electric field lines.

I don't know which concept and formula is used

what is the mass of the bidy
 a charge of 2microcoulomb experience a force of 6N when placed at a point in an electric field .find electric field at that point

d derive an expression for electric field intensity due to uniformly charged ring on it axix

1st
 what is electric field intensity? What is its S.I unit?

answer
 an infinite line charge produces a field of 9×10^4 N/C at a distance of 2 cm calculate the linear charge
 Three charges \( 1 \mathrm{C},1 \mathrm{C} \), and \( 2 \mathrm{C} \) are kept on \( X \) axis \( 5 \mathrm{~cm}, x=0 \mathrm{~cm} \) amd \( x=10 \mathrm{~cm} \) respectively find net force one each of them
 ln a Millikan’s oil drop experiment, the horizontal plates are 1.5 cm apart. With the electric field switch off an oil drop is observed to fall with a steady velocity of 2.5×10^{2} cm s^{1}. When the field is switched on the upper plate being positive, the drop just remains stationary when the p.d. between the plates is 1500 V. Calculate the radius of drop (b) How many electronic charges does it carry? (c)If the p.d. between the two plates remains unchanged, with what velocity will the drop move when it has collected two more as a result of exposure to ionising radiation? (Oil density, rho=900 kgm^{3} , Viscosity of air, eta =1.8×10^{5} Nsm^{2}, Density of air, σ=1.293 kg m^{3})