HOTS IV — task. Science CBSE, Class 10.

PUMPA - SMART LEARNING

எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

Book Free Demo

1. 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)

Did you find an error?

57. HOTS IV