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QNEET-2013-Ph-1512: NEET 2013 Physics - Class 12 NEET-2013-Ph-1512 Solution: The resistances of the four arms P Q R and S in a Wheatstone's…
The resistances of the four arms P Q R and S in a Wheatstone's bridge are 10 ohm 30 ohm 30 ohm and 90 ohm respectively. The e.m.f. and internal resistance of the cell are 7 volt and 5 ohm respectively. If the galvanometer resistance is 50 ohm the current drawn from the cell will be 0.1 A 2.0 A 1.0 A 0.2 A
Multiple Choice Options
- A 0.1 A
- B 2.0 A
- C 1.0 A
- D 0.2 A
Step-by-Step Verified Solution
From the question, total resistance of Wheatstone bridge is:
(40) _ (120)/(40 + 120) = 30 �
Now the current through the cell is:
= 7V/(5+30) � = (1/5)A = 0.2A