CBSE Class 12-science - Electric Field Videos

• 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})

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