Question

When the net force is zero ,the torque is independent of the origin.What it do mean.In case of dipole along a uniform field

Answer 1

It means that you can choose any point, O, and calculate the torque about O on the positive charge. Then calculate the torque about O on the negative charge. Then add the two torques, taking account of their senses (or their directions, if representing them by vectors). You should find that the resultant torque is qd sin θ" role="presentation" style="margin: 0px; padding: 0px; border: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-numeric: inherit; font-weight: normal; font-stretch: inherit; font-size: 15px; line-height: normal; font-family: Georgia, "Times New Roman", Times, serif; vertical-align: baseline; box-sizing: inherit; display: inline; text-indent: 0px; text-align: left; text-transform: none; letter-spacing: normal; word-spacing: 0px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; color: rgb(36, 39, 41); orphans: 2; widows: 2; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-style: initial; text-decoration-color: initial; position: relative;">qd sin θqd sin θ in which d" role="presentation" style="margin: 0px; padding: 0px; border: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-numeric: inherit; font-weight: normal; font-stretch: inherit; font-size: 15px; line-height: normal; font-family: Georgia, "Times New Roman", Times, serif; vertical-align: baseline; box-sizing: inherit; display: inline; text-indent: 0px; text-align: left; text-transform: none; letter-spacing: normal; word-spacing: 0px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; color: rgb(36, 39, 41); orphans: 2; widows: 2; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-style: initial; text-decoration-color: initial; position: relative;">dd is the separation of the charges and independent of your choice of O.

Answer 2

Ya i think this anwer is right