Question

Q. Resistance 8 ohm is in left gap and parallel combination of 18 ohm and 36 ohm is in right gap of meter bridge the null point is obtained at - a) 25 cm from left end. b) 40 cm from right end. c) 40 cm from left end. d) 62 cm from left end.​

Answer 1

Explanation:

12th

Physics

Current Electricity

Meter Bridge and Problems on It

ANSWER

40R1=60X    case(1)

R1=32X

50R2=50X      case(2)

R2=X

y1R1+R2=100−y1x        case(3)

y132

Answer 2

Concept Introduction:

A device that uses the Wheatstone bridge idea is a meter bridge, often known as a sliding wire bridge. As with a Wheatstone bridge, a meter bridge is utilized to determine the conductor's unknown resistance.

Solution:

Given, Resistance $8$ ohm is in left gap and parallel combination of $18$ ohm and $36$ ohm is in right gap of meter bridge

We have to find where the null point will be obtained

$l1 + l2 = 1$ m

Applying the formula of meter bridge,

$l1 / l2 = 8 / (( 18$ ×$36 ) / 18+ 36 )$

$l1 + l2 = 8/9$

$l1 / 1 -l1 = 8/9$

$l1= 0.47$

Final Answer:

The final answer is 40 cm from right end.

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