# ISC Class XII Exam Question Papers 2012: Physics Practical

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1. Upamanyu Mukherjee says:

what is fixed resistance in exp 2

1. Anwesha Bose says:

Hello Upamanyu

From the graph you get in the wheatstone bridge experiment, you need to find the value of r. When the experiment is given in your final exams practicals, the lab may give you any value of r.

The value of the fixed resistor used in the circuit is usually 10 ohms, but again that depends sometimes on the lab.

How to find r

Step 1: First set up the circuit as shown.
Step 2: Keep the crocodile clip at the extreme end of the wire that has been marked as CD. l1=50 cm.
Step 3: Now slowly move the jockey to a position such that galvanometer shows zero deflection. Note down this l2.
Step 4: Now change the position of the crocodile clip such that l1 = 5 cm.
Step 5: Repeat Step 3.

Repeat steps 4 and 5 for values of l1=5,10,15,20,25,30,35,40; note down corresponding l2.

Now plot the graph of l1 vs l2.