In the circuit above, V2 is lower than V1 by how many dB?

3dB, or -3dB if you prefer

6dB, or -6dB if you prefer

12dB, or -12dB if you prefer

24dB, or -24dB if you prefer

Answer: 12dB. The voltage divider drops the voltage by 1/4. Every doubling or halving of voltage is 6dB, so 1/4 = 1/2 * 1/2 === 6dB + 6dB = 12dB.