State Lenz's law of electromagnetic induction. The magnetic threading of'a coil changes from `12 xx 10^(-3)` Wb to `6 xx 10^(-3)` Wb in 0.01 second. Calculate the induced emf.

Explanation

### Step-by-Step Solution:

1. **State Lenz's Law**:
Lenz's law states that the direction of induced current in a closed loop is such that it opposes the change in magnetic flux that produced it. In other words, if the magnetic flux through a coil increases, the induced current will flow in a direction that creates a magnetic field opposing the increase. Conversely, if the magnetic flux decreases, the induced current will flow in a direction that creates a magnetic field supporting the original flux.

2. **Identify the Given Values**:
- Initial magnetic flux, \( \Phi_1 = 12 \times 10^{-3} \, \text{Wb} \)
- Final magnetic flux, \( \Phi_2 = 6 \times 10^{-3} \, \text{Wb} \)
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