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$$V_{c}=\frac{1}{L}\times \frac{\Delta\theta}{\Delta B}=\frac{1}{0.1}\times2.1095\frac{radians}{T}=21.095\frac{radians}{T*m}$$  3. Lock-in Method  $$I_{coil_dc}=0.6137\times V_{coil_dc}$$ $$I_{rms}=0.6137\times V_{rms}$$  $$B=11.1\times\frac{mT}{A}\times I$$  $$Gain=G_{preamplifier}\times G_{filter}\times G_{lock-in-amplifier}\times G_{lowpass filter}=500\times2\times10\times1=10000$$  $$V_{Photodiode}=\frac{V_{output}\times1.11}{10000}$$