- $ {L_M} - {L_N} = 10\\\log \\\frac{{{I_N}}}{{{I_M}}}\\\left( {dB} \\\right)$
- $ \\\frac{{{L_M}}}{{{L_N}}} = 10\\\log \\\frac{{{I_N}}}{{{I_M}}}\\\left( {dB} \\\right)$
- $ \\\frac{{{L_M}}}{{{L_N}}} = 10\\\log \\\frac{{{I_M}}}{{{I_N}}}\\\left( {dB} \\\right)$
- $ {L_M} - {L_N} = 10\\\log \\\frac{{{I_M}}}{{{I_N}}}\\\left( {dB} \\\right)$