4. The circuit given in Figure 3.4 below is called the Wheatstone bridge circuit. The detector in this circuit may be an ammmeter or voltmeter. Determine the conditions on R1, R2, R3, and R4 such that Vbc = 0V and iD = A, in other words detector will display zero. 3. Use the principle of voltage division to calculate Vo(t) and V1(t) in the following circuit. Solution 3: The conditions are R1=R4 R2=R3 4:Let I be the current in the circuit V0(t)=I*6.8 V1(t)=I*1.