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Ten identical cells connected in series are required to heat a wire of length \(1\) metre and radius \(r\) by \(10^\circ ~\text{C}\) in time \(t.\) How many cells will be needed to heat a wire of length \(2\) metres with the same radius by the same temperature in the same time \(t?\)
| 1. | \(20\) | 2. | \(30\) |
| 3. | \(40\) | 4. | \(10\) |
Subtopic: Â Grouping of Cells |
 64%
Level 2: 60%+
NEET - 2013
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Two cells having the same emf, are connected in series through an external resistance R. Cells have internal resistance r1 and r2 respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of R is:
1.
2.
3.
4.
Subtopic: Â Grouping of Cells |
 51%
Level 3: 35%-60%
AIPMT - 2006
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