Question

State and verify the law of parallel combination of resistances using three resistors.
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Answer 1

Answer:

Aim

To verify the laws of combination (parallel) of resistances using a metre bridge.

Apparatus

A metre bridge, a Leclanche cell (battery eliminator), a galvanometer, a resistance box, a jockey, two resistance wires or two resistance coils known resistances, a set square, sand paper and connecting wires.

Theory

to-verify-the-laws-of-combination-parallel-of-resistances-using-a-metre-bridge-12

where R is the resistance from the resistance box in the left gap and l is the length of the metre bridge wire from zero end up to balance point.

to-verify-the-laws-of-combination-parallel-of-resistances-using-a-metre-bridge-13

Circuit diagram

to-verify-the-laws-of-combination-parallel-of-resistances-using-a-metre-bridge-14

to-verify-the-laws-of-combination-parallel-of-resistances-using-a-metre-bridge-15

Procedure

Mark the two resistance coils as r1 and r2.

To find r1 and r2 proceed same way as in Experiment 1. (If r1 and r2 are not known.)

Connect the two coils r1 and r2 in parallel as shown in figure in the right gap of metre bridge and find the resistance of this combination. Take at least three sets of observations.

Record your observations.

Observations

Table for length(l) and Unknown resistance (x)

to-verify-the-laws-of-combination-series-of-resistances-using-a-metre-bridge-11

Calculations

to-verify-the-laws-of-combination-parallel-of-resistances-using-a-metre-bridge-16

Result

Within limits of experimental error, experimental and theoretical values of Rp are same. Hence, law of resistances in parallel is verified.

Precautions

Same as in Experiment 1.

Answer 2

Answer:

1. 1/Rp= 1/R¹+1/R²
2. reciprocal kare ge
3. Rp=R¹+R²

Explanation:

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