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Three cells are connected to an external...

Three cells are connected to an external resistance as shown in the figure. Each of the cells has emf 10 V and internal resistance `2Omega`.

If the external resistance is `6Omega`. Find the current in the circuit.

A

2A

B

`2.5` A

C

3A

D

`3.5` A

Text Solution

Verified by Experts

The correct Answer is:
B
`I=(3E)/(R+3r)=(3xx10)/(6+3xx2)=(30)/(12)=2.5A`
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CENGAGE PHYSICS-SOURCES OF ELECTRIC CURRENT-MANDATORY EXERCISE (Exercise Set II)
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  2. In parallel combination, the effective resistance (of R(1) and R(2)) i...

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  3. In order to obtain a maximum current from a combination of cells, we m...

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  4. If n identical cells, each of emf E, are joined in series, the net emf...

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  5. Battery is a source of

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  6. Which is the correct relation for emf of a cell ?

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  7. What must be the current in a circuit if potential difference across a...

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  8. The direction of current outside the battery is

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  9. The direction of current inside a battery is

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  10. The materials used as electrodes in simple voltaic cell are

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  11. Which substance is liberated at the cathode of a simple voltaic cells ...

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  12. Which substance is liberated at the anode of a simple voltaic cell ?

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  13. In voltaic cells potential difference is produced due to

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  14. Polarization occurs in simple voltaic cells because

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  15. Which meterial is deposited at the zinc electrode in a carbon - zinc c...

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  16. Three cells are connected to an external resistance as shown in the fi...

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  17. Consider a circuit as shown below. What is the total emf in the c...

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  18. In the circuit shown below, what is the equivalent resistance ?

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  19. What is the potential difference across resistor in the given circuit ...

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  20. What is the equivalent resistance in the given circuit ?

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