Question 362: Current Electricity

Question

In a meter bridge experiment null  point is obtained at $$20$$ $$cm$$, from one end of the wire when resistance $$X$$ is balanced against another resistance $$Y.$$ If $$X < Y$$, then where will be the new position of the null point from the same end, if one decides to balance a resistance of $$4$$ $$X$$ against $$Y$$

Accepted Answer

In the first case $${X \over Y} = {{20} \over {80}} = {1 \over 4}$$
In the second case $${{4X} \over Y} = {\ell  \over {100 - \ell }} \Rightarrow \ell  = 50$$

Answer

$$40$$ $$cm$$

Answer

$$80$$ $$cm$$

Answer

$$50$$ $$cm$$

Answer

$$70$$ $$cm$$

Current Electricity

In a meter bridge experiment null point is obtained at $20 cm, from one end of the wire when resistance X is balanced against another resistance Y. If X < Y, then where will be the new position of the null point from the same end, if one decides to balance a resistance of 4 X against Y

Choose the correct answer: