JEE MAIN - Physics (2021 - 18th March Evening Shift - No. 19)
Consider a 72 cm long wire AB as shown in the figure. The galvanometer jockey is placed at P on AB at a distance x cm from A. The galvanometer shows zero deflection.
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The value of x, to the nearest integer, is ___________.
The value of x, to the nearest integer, is ___________.
Answer
48
Explanation
As galvanometer shows zero deflection so it act's as balanced wheatstone bridge.
$$ \therefore $$ $${{12} \over 6} = {x \over {72 - x}}$$
$$ \Rightarrow $$ 14 $$-$$ 2x = x
$$ \Rightarrow $$ 3x = 144
$$ \Rightarrow $$ x = 48 cm
$$ \therefore $$ $${{12} \over 6} = {x \over {72 - x}}$$
$$ \Rightarrow $$ 14 $$-$$ 2x = x
$$ \Rightarrow $$ 3x = 144
$$ \Rightarrow $$ x = 48 cm
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