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Q.

A resistance of 20 ohms has a current of 2 amperes flowing in it. What potential difference is there between its ends?


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a

20 V

b

30 V

c

40 V

d

10 V 

answer is C.

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Detailed Solution

A resistance of 20 ohms has a current of 2 amperes flowing in it.40 V Potential difference is there between its ends.
Given Current, = 2 A
Resistance, = 20 Ω,
We know that Ohm’s law
= I R
Putting the values, we get
= 2 × 20
= 40 V
Hence, 40 volt is the required value of potential difference.   
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A resistance of 20 ohms has a current of 2 amperes flowing in it. What potential difference is there between its ends?