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ICSE Class 10 Physics 2019 Solved Paper

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The diagram above shows a circuit with the key k open. Calculate :
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Question : 60
Total: 74
the current drawn from the cell when the key k is open.
Solution:  
When the key K is open,
I‌=‌
E
R+r
=‌
3.3
5+0.5

‌=‌
3.3
5.5
=‌
3
5
=0.6A
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