plzzzzz answer 39 and 40
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question 40
1) when cells favour each other
total emf =1.5 +1.3= 2.8
let us consider one cell of emf 2.8.2.8V will be parallel with null pointed length so potential of that should also be 2.8
2.8 = length of null point ×0.28 × 20/ 10
ans will be 5 meter
2) when in oppose 1.5 -1.3 = 0.2
0.2 = lengthof null point × 0.28 × 20/10
ans will be 0.35meter
1) when cells favour each other
total emf =1.5 +1.3= 2.8
let us consider one cell of emf 2.8.2.8V will be parallel with null pointed length so potential of that should also be 2.8
2.8 = length of null point ×0.28 × 20/ 10
ans will be 5 meter
2) when in oppose 1.5 -1.3 = 0.2
0.2 = lengthof null point × 0.28 × 20/10
ans will be 0.35meter
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