Figure Q4(a) shows the circuit of a Wheatstone Bridge. Null occurs when R1= 1000 Ω, R2= 700 Ω, R3=500 Ω. Find R4. R2 R, R3 Figure Q4(a) Figure Q4(a) shows the circuit of a Wheatstone Bridge. Null...

Figure Q4(a) shows the circuit of a Wheatstone Bridge. Null occurs when R1=

1000 Ω, R2= 700 Ω, R3=500 Ω. Find R4.

Extracted text: R2 R, R3 Figure Q4(a)


Extracted text: Figure Q4(a) shows the circuit of a Wheatstone Bridge. Null occurs when R1= 1000 Ω, R700 Ω, R;-500 Ω. Find Ri . (2 marks)