Question
An electric dipole of dipole moment p is placed in a uniform electric field E with its axis inclined to the field. Write an expression for the torque 
experienced by the dipole in vector form. Show diagrammatically how the dipole should be kept in the electric field so that torque acting on it is:
i) maximum
ii) zero
Solution
Expression for torque in the vector form is:
;
where,
p is the dipole moment, and
E is the electric field.
i) When torque acting is maximum, dipole should be placed perpendicular to the electric field.
ii) When torque acting is zero, dipole is placed parallel to the magnetic field.
capacitors. Show with the help of a diagram how you will arrange minimum number of them to get a resultant capacitance of 20 
.
. 
,
is the temperature of the hot junction in oC. Find the neutral temperature of the thermocouple.
