First slide

combination of resistance

Question

In the Wheatstone's bridge (shown in figure), X = Y and A > B. The direction of the current between ab will be

Moderate

A

from a to b
B

from b to a
C

from b to a through c
D

from a to b through c

Solution

In the part cbd,
$V_{c} - V_{b} = V_{b} - V_{d} \Rightarrow V_{b} = \frac{V_{c} + V_{d}}{2}$
In the part c a d,
$V_{c} - V_{a} > V_{a} - V_{d} \Rightarrow \frac{V_{c} + V_{d}}{2} > V_{a} \Rightarrow V_{b} > V_{a}$

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