InterviewSolution
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InterviewSolution
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The smilling face of Fig, consists of three parts , (i) a thin rod of charge `-3.0 muC` that forms a full circle of radius 6.0 cm. (ii) a thin rod of charge `2.0 muC` that forms a circular are of radius 4.0 cm, subtending an angle of `90^(@)` about the centre of full circle, and (iii) and electric diipole with dipole moment `= 1.28xx10^(-21)` Cm perpendicular to a radial line as shown in Fig. What is the net electric potentail as the centre ? |
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Answer» Here, `q_(1) = -3.0 muC, r_(1) = 6.0 cm` `V_(1) = (q_(1))/(4pi in_(0) r_(1)) = (k-(-3.0))/(6.0) = - (k)/(2) muC//cm`, where `k = (1)/(4pi in_(0))` Again, `q_(2) = + 2 muC, r_(2) = 4.0 cm` `V_(2) = (q_(2))/(4pi in_(0) r^(2)) = (k(+2.0))/(4.0)= (k)/(2) muC//cm`, For the dipole, `theta = 90^(@)` Potential due to dipole at the center `V_(3) = (p cos theta)/(4pi in_(0) r^(2)) = (p cos 90^(@))/(4pi in_(0) r^(2)) = 0` `:.` Net electric potential at the center `V = V_(1) + V_(2) + V_(3) = (k)/(2) (k)/(0) + 0 = ` zero. |
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