A particle A having charge of `2.0xx10^-6C` and a mass of 100 g is fixed at the bottomk of a smooth inclined plane of inclination `30^@`. Where should another particle B having same charge and mass, be placed o the inclined plane so that B may remain in equilibrium?A. 8 cm from the bottomB. 13 cm from the bottomkC. 21 cm from the bottomD. 27 cm from the bottom

A particle A having charge of `2.0xx10^-6C` and a mass of 100 g is fix

1.	A particle A having charge of `2.0xx10^-6C` and a mass of 100 g is fixed at the bottomk of a smooth inclined plane of inclination `30^@`. Where should another particle B having same charge and mass, be placed o the inclined plane so that B may remain in equilibrium?A. 8 cm from the bottomB. 13 cm from the bottomkC. 21 cm from the bottomD. 27 cm from the bottom
Answer» Correct Answer - D `1/(4piepsilon_0)q^2/r^2=mg sintheta` `r=sqrt((1/(4piepsilon_0))(q^2/(mgsintheta)))` `sqrt(((9xx10^9)(2.0xx10^-6)^2)/((0.1)(9.8)sin30^@))` `=27xx10^-2m` `=27cm

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