Chapter 2: Electrostatic Potential and Capacitance. Starting from the concept of electrical work, we establish the concept of electrostatic potential energy. This energy per unit charge is defined as the electric potential. We obtain an expression for the potential of a source charge by bringing a unit test charge from infinity to a location in the space. Similarly, using the geometry, we can find the potential due to the dipole. Moreover, we can relate the electric field and the potential also. Usually, the electric field is taken as the negative of the potential gradient. To create a system of charges, we have to spend some energy and this will be stored as the potential energy of the system. The same logic can be extended for rotating a dipole in an external field. Here also, by doing work against the net torque of the uniform external field, we can store the energy in the dipole. A very interesting point of discussion in Chapter 2 is related to the elec...
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