[" Illustration "1.36" Three "3" at "2" " "1],[" charges "-q,+2q" ,and "-q" are "(3)/(4)+2q-(q)/(4)-((-a)-1)/(4)],[" Fig."[" Fig."1.01." Calculate the field ",.quad +quad (r+a)],[" at a distance "r>2" on the line."," Fig."1.101]]

Three charges -q,+2q, and -q are arranged on a line as shown in fig. Calculate the field at a distance rgtgta on the line.

Three charges -q,+2q, and -q are arranged on a line as shown in fig. Calculate the field at a distance rgtgta on the line.

For three vectors p, q and r, if r = 3p + 4q and 2r = p - 3q, then

Two point charges q_(1) and q_(2) , of magnitude +10^(-8) C and -10^(-8) C , respectively, are placed 0.1 m apart. Calculate the electric fields at points A, B and C shown in Fig.

[" Two uniformly charged non "],[" conducting spheres of radii "R_(1)" and "],[R_(2)" having charges "Q_(1)" and "Q_(2)],[" respectively are seperated by "],[" distance "r" .Total electrostatic "],[" energy of this system is "],[qquad [U=(1)/(4 pi epsilon_(0)){(3Q_(1)^(2))/(5R_(1))+(3Q_(2)^(2))/(5R_(2))+(Q_(1)Q_(2))/(r)}],[U=(1)/(4 pi epsilon_(0)){(3Q_(1)^(2))/(5R_(1))+(3Q_(2)^(2))/(5R_(2))-(Q_(1)Q_(2))/(r)}],[U=(1)/(4 pi epsilon_(0)){(Q_(1)^(2))/(5R_(1))+(3Q_(2)^(2))/(5R_(2))-(Q_(1)Q_(2))/(r)}],[U=(1)/(4 pi epsilon_(0)){(3Q_(1)^(2))/(5R_(1))+(3Q_(2)^(2))/(R_(2))+(Q_(1)Q_(2))/(r)}]]

Find the value of : 2p + 3q + 4r + por when p =-1,q = 2 and r = 3

4q^(3)-6q^(2)-4q+3;2q-1