(b) Write a symbolic expression for the sum of the voltages around Loop abdain terms of 1₁, 13, R₁ and R3. Note that I already set the sum equal to 0.Σv₁ =abda= 0(c) Write a symbolic expression for the sum of the voltages around Loop bcdbin terms of 12, 14, R₂ and R4. Note that I already set the sum equal toΣv₁ =bcdb= 0(d) What can you conclude about the currents based on the junction rule?O 1₁ = 13 and 1₂ = 14O 1₁ 1₂ and 13 = 14O 1₁ = 14 and 1₂ = 13R4 =(e) Write a symbolic expression for the mystery resistance in terms of R₁, R₂, and R3. The circuit shown in the diagram, called a Wheatstone Bridge,is a device used to measure an uknown electrical resistance.Resistors R₁ and R₂ have known resistances, and R3 is anadjustable resistor known as a potentiometer (hence the arrow).The middle resistor, r, is just there to make sure the ammeter (A)doesn't get trashed. Resistor R4 is the mystery resistor.The potentiometer resistance, R3, is adjusted until the currentthrough the ammeter is zero. At that point, the bridge is said tobe "balanced" and the value of the uknown resistance, R4, can bedetermined from R₁, R₂, and R3. Pretty cool huh?aApply Kirchoff's Loop Rule and Junction Rule to the Balanced Bridge.R₁R3(a) When the bridge is balanced, the voltage between points b and d will be equal to13-Select--- ✓-Select----128-εzero+½2€+ε(A)ER2

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