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Question

If cells are joined in parallel, they have _______.


A

same current

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B

same potential difference

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C

same resistance

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D

same power

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Solution

The correct option is B

same potential difference


Parallel circuit (Example):

  1. The voltage/potential difference across a parallel circuit is constant. Hence, VS=V1=V2=V3
  2. The current across a parallel circuit is given by Itotal=I1+I2+I3
  3. The resistance across a parallel circuit is given by 1Rtotal=1R1+1R2+1R3
  4. The power across a parallel circuit is given by Ptotal=P1+P2+P3

Explanation for the correct option:

Option B:

  1. From the above example, the potential difference across a parallel circuit is constant.
  2. Hence, this is the correct option.

Explanation for the incorrect options:

Option A:

  1. From the above example, the current across a parallel circuit is not constant.
  2. Hence, this is not the correct option.

Option C:

  1. From the above example, the resistance across a parallel circuit is not constant.
  2. Hence, this is not the correct option.

Option D:

  1. From the above example, the power across a parallel circuit is not constant.
  2. Hence, this is not the correct option.

Hence, option (B) is the correct option.


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