Question: What is the time constant (τ) in an RC circuit?

Options:

1. τ = R + C
2. τ = R * C
3. τ = R/C
4. τ = 1/(R*C)

Correct Answer: τ = R * C

Solution:

The time constant τ in an RC circuit is given by τ = R * C, where R is the resistance and C is the capacitance.