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5 rows of 10 identical cells, connected ...

5 rows of 10 identical cells, connected series, send a current I through an external resistance of 20 Ohm.
If the emf and internal resistance of each cell is 1.5 V and 1 Ohm respectively then, value of current (I) is:

A

0.25 A

B

0.14 A

C

0.68 A

D

0.75 A

Text Solution

Verified by Experts

The correct Answer is:
C
Equivalent emf E = 15 V
Equivalent internal resistance
`r = 2 Omega`
`I = E/(R+r)`
` = 15/(20 +2) = 15/12 = 0.68 A`
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