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The number of dry cells, each of e.m.f. 1.5 volt and internal resistance 0.5 ohm that must be joined in series with a resistance of 20 ohm so as to send a current of 0.6 ampere through the circuit is
  • a)
    2
  • b)
    8
  • c)
    10
  • d)
    12
Correct answer is option 'C'. Can you explain this answer?
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Given data:
- E.m.f. of each dry cell = 1.5 V
- Internal resistance of each dry cell = 0.5 ohm
- Resistance of the circuit = 20 ohm
- Current through the circuit = 0.6 A

Calculating total resistance:
Total resistance (R_total) = Resistance of the circuit + Internal resistance of each dry cell
R_total = 20 ohm + (number of dry cells * 0.5 ohm)

Calculating total e.m.f.:
Total e.m.f. (E_total) = E.m.f. of each dry cell * number of dry cells
E_total = 1.5 V * number of dry cells

Applying Ohm's Law:
Using Ohm's Law (V = IR), we can find the total e.m.f. as:
E_total = I * R_total
1.5 V * number of dry cells = 0.6 A * (20 ohm + 0.5 ohm * number of dry cells)

Solving for number of dry cells:
1.5 * number of dry cells = 0.6 * (20 + 0.5 * number of dry cells)
1.5 * number of dry cells = 12 + 0.3 * number of dry cells
1.2 * number of dry cells = 12
number of dry cells = 12 / 1.2
number of dry cells = 10
Therefore, the number of dry cells that must be joined in series with a resistance of 20 ohm to send a current of 0.6 ampere through the circuit is 10. So, the correct answer is option C.
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The number of dry cells, each of e.m.f. 1.5 volt and internal resistance 0.5 ohm that must be joined in series with a resistance of 20 ohm so as to send a current of 0.6 ampere through the circuit isa)2b)8c)10d)12Correct answer is option 'C'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about The number of dry cells, each of e.m.f. 1.5 volt and internal resistance 0.5 ohm that must be joined in series with a resistance of 20 ohm so as to send a current of 0.6 ampere through the circuit isa)2b)8c)10d)12Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The number of dry cells, each of e.m.f. 1.5 volt and internal resistance 0.5 ohm that must be joined in series with a resistance of 20 ohm so as to send a current of 0.6 ampere through the circuit isa)2b)8c)10d)12Correct answer is option 'C'. Can you explain this answer?.
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