Derive an expression for the torque acting on an electric dipole placed in a uniform electric field.

Explanation

To derive the expression for the torque acting on an electric dipole placed in a uniform electric field, follow these steps:

### Step 1: Understanding the Setup
Consider an electric dipole consisting of charges \( +Q \) and \( -Q \) separated by a distance \( 2L \). Place this dipole in a uniform electric field \( \mathbf{E} \).

### Step 2: Forces on the Charges
The force on the positive charge \( +Q \) due to the electric field \( \mathbf{E} \) is:
\[ \mathbf{F}_+ = Q \mathbf{E} \]
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