Network PQRS is made as under: \( P Q \) has a battery of \( 4 \mathrm{~V} \) and negligible res...

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Network PQRS is made as under: \( P Q \) has a battery of \( 4 \mathrm{~V} \) and negligible resistance with positive terminal connected to \( P, Q R \) has a resistance of \( 60 \Omega \). PS has a battery of \( 5 \mathrm{~V} \) and negligible resistance with positive terminal connected to \( P, R S \) has a resistance of \( 200 \Omega \). If a milliammeter, of \( 20 \Omega \) resistance is connected between \( P \) and \( R \), calculate the reading of the milliammeter.
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