Dipole, Linear Charge density
Dipole If the dipole moment vector P =2 i - j and electric field vector (external) E = i + j then find the torque in vector form also find its magnitude torque τ=P X E ie τ=( 2i-j) X (i+j)=2k-(-k) • • • τ= 3 k its magnitue is 3 units Linear Charge Density Find the electric field at a distance of 3cm from an infinite wire of linear charge density 0.2× 10 -3 C/m E=(1/4πε 0 )(2λ/r) E=9 ×10 9 (2×0.2× 10 -3 )/3×10 -2 E=1.2×10 8 NC -1