KCET2017PhysicsRay Optics
In metre bridge experiment, with a standard resistance in the right gap and a resistance coil dipped in water (in a beaker) in the left gap, the balancing length obtained is '1'. If the temperature of water is increased, the new balancing length is
Options
- A(>l )
- B( < l )
- C( =l )
- D( =0 )
Correct answer
A. (>l )
Step-by-step solution
Given, balancing length of bridge with standard resistance in right gap and a resistance coil dipped in water in left gap is ( I=1 ). If temperature of water is increased the new balancing length is greater than ( 1 ). Unknown resistance is calculated as ( X=R l (1-l) ) If temperature increases then resistance increases. Thus, option (1) is correct.