Question 636: Current Electricity

Question

The resistances in the two arms of the meter bridge are 5 $$\Omega $$ and R$$\Omega $$ respectively. When the resistance R is shunted with an equal resistance, the new balance point is at 1.6$$l$$
1
. The resistance R is

Accepted Answer

This is a balanced wheatstone bridge condition,
$${5 \over R} = {{{\ell _1}} \over {100 - {\ell _1}}}$$
and $${5 \over {R/2}} = {{1.6{\ell _1}} \over {100 - 1.6{\ell _1}}}$$
$$ \Rightarrow R = 15\Omega $$

Answer

10 $$\Omega $$

Answer

15 $$\Omega $$

Answer

20 $$\Omega $$

Answer

25 $$\Omega $$

Current Electricity

The resistances in the two arms of the meter bridge are 5 $\Omega and R\Omega respectively. When the resistance R is shunted with an equal resistance, the new balance point is at 1.6l$ 1 . The resistance R is

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