if the balance point is obtained at 35 cm in a metre bridge the resistance in the left and right gaps are in the ratio of
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Balance point is obtained at 35 cm in a meter bridge .
Metre Bridge is a device which works on the principle of Balanced Wheatstone Bridge. It helps us to calculate the resistance of an unknown resistor in presence of a known shunt resistance.
It consists of the following parts :
Unknown Resistance
Shunt Resistance
1 metre or 100 cm long wire
Since balance point is obtained at 35 cm , we can consider Balanced Wheatstone Bridge condition such that the adjacent resistances will be in ratio.
Let the resistances be P and Q and l be the balance point :
Q
P
=
100−l
l
Q
P
=
100−35
35
Q
P
=
65
35
⇒
13
7
So the resistances will be in the ratio of : 7:13
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