In the Wheatstone bridge experiment shown in the figure the values of the resistors are R1=3.3 kΩ, R2=1.1 kΩ, R3=6.6 kΩ . a) Calculate the value of resistor Rx when the current in the ampere-meter is zero. b) Interchanging the locations of  which of two resistors does not change the value of Rx?  Write it down with the reason. c) What is the role of the resistor with a resistance of 2.2 kΩ connected in series with ammeter? Is it possible to execute the experiment without this resistor?

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Ohm's law

Ohm’s law is a prominent concept in physics and electronics. It gives the relation between the current and the voltage. It is used to analyze and construct electrical circuits. Ohm's law states that the voltage across a conductor is directly proportional to the current flowing through it.

Path of Least Resistance

In a series of alternate pathways, the direction of least resistance is the actual or metaphorical route that offers the least resistance to forwarding motion by a given individual or body.