In a metre bridge a copper coil is connected in the right gap and a resistance of 10- in the left gap- The balance point is obtained at 0-2 m- The resistance of the coil is-

The correct option is A 40 Ω PQ=l1 l #160; ⇒10Q=0.20.8 ⇒ Q=40 Ω ...

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Standard XII

Physics

Motional EMF

In a metre br...

Question

In a metre bridge a copper coil is connected in the right gap and a resistance of $10 Ω$ in the left gap. The balance point is obtained at $0.2 m$ . The resistance of the coil is:

40 Ω

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5 Ω

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20 Ω

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2.5 Ω

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Solution

The correct option is A $40 Ω$
$\frac{P}{Q} = \frac{l}{1 - l} \Rightarrow \frac{10}{Q} = \frac{0.2}{0.8}$
$\Rightarrow Q = 40 Ω$

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In a metre bridge a copper coil is connected in the right gap and a resistance of 10 Ω in the left gap. The balance point is obtained at 0.2 m. The resistance of the coil is:

The correct option is A 40 ΩPQ=l1−l⇒10Q=0.20.8⇒Q=40 Ω

In a metre bridge a copper coil is connected in the right gap and a resistance of $10 Ω$ in the left gap. The balance point is obtained at $0.2 m$ . The resistance of the coil is:

The correct option is A $40 Ω$
$\frac{P}{Q} = \frac{l}{1 - l} \Rightarrow \frac{10}{Q} = \frac{0.2}{0.8}$
$\Rightarrow Q = 40 Ω$