A magnetic needle possesses a dipole moment M . It is now bent at the middle to form L shape . What will be the effective dipole moment of the L shape ?

Explanation

To solve the problem of finding the effective dipole moment of an L-shaped magnetic needle that was originally a straight needle with a dipole moment \( M \), we can follow these steps:

### Step 1: Understand the Original Dipole Moment
The original magnetic needle has a dipole moment \( M \), which can be expressed as:
\[ M = m \cdot L \]
where \( m \) is the pole strength and \( L \) is the length of the needle.
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