The current in a coil of resistance 90 ohms is to be reduced by 90 percent. What value of resistance should be connected in parallel with it?

9 Ω

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90 Ω

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1000 Ω

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10 Ω

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Solution

The correct option is D $10 Ω$
The resistance is connected in parallel. Hence, voltage across the required resistance S and 90Ω is the same, i.e.
$i_{g} = \frac{i}{10}$
$\Rightarrow$ Required shunt $S = \frac{G}{(n - 1)} = \frac{90}{(10 - 1)} = 10 Ω$

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The current in a coil of resistance 90 ohms is to be reduced by 90 percent. What value of resistance should be connected in parallel with it?

The correct option is D 10ΩThe resistance is connected in parallel. Hence, voltage across the required resistance S and 90Ω is the same, i.e.ig=i10⇒ Required shunt S=G(n−1)=90(10−1)=10Ω

The correct option is D $10 Ω$
The resistance is connected in parallel. Hence, voltage across the required resistance S and 90Ω is the same, i.e.
$i_{g} = \frac{i}{10}$
$\Rightarrow$ Required shunt $S = \frac{G}{(n - 1)} = \frac{90}{(10 - 1)} = 10 Ω$