PUMPA - SMART LEARNING
எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்
Book Free Demo1. A resistance of \(2\ \Omega\) is connected across one gap of a meter-bridge (length of the wire is \(100\ cm\)) and an unknown resistance greater than \(2\ Omega\) is connected across the other gap. When the resistances are interchanged, the balance point shifts by \(20\ cm\). Neglecting any corrections, the unknown resistance is:
2. The length of a wire of a potentiometer is \(100\ cm\),and the emf of its standard cell is \(E\ volt\). It is employed to measure the emf of a battery whose internal resistance is \(0.5\ \Omega\). If the balance point is obtained at \(l\ =\ 30\ cm\) from the positive end, the emf of the battery is:
(where i is the current in the potentiometer wire)
(where i is the current in the potentiometer wire)
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