Potentiometer: comparing emfs with the cells aiding and opposing (sum and difference method)

1. A.
   $\frac{l_1}{l_1 + l_2}$
2. B.
   $\frac{l_1}{l_1 - l_2}$
3. C.
   $\frac{l_1 + l_2}{l_1}$
4. D.
   $\frac{l_1 + l_2}{l_1 - l_2}$

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1. A.
   1:2
2. B.
   2:3
3. C.
   3:4
4. D.
   5:3

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1. A.
   3:2
2. B.
   2:3
3. C.
   1:3
4. D.
   3:1

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1. A.
   3 m, 0.25 m
2. B.
   0.25 m, 3 m
3. C.
   2.5 m, 0.3 m
4. D.
   0.3 m, 2.5 m

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1. A.
   1:2
2. B.
   2:1
3. C.
   1:3
4. D.
   3:1

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1. A.
   $\frac{l_{1}}{l_{1} + l_{2}}$
2. B.
   $\frac{l_{1}}{l_{1} - l_{2}}$
3. C.
   $\frac{l_{1} - l_{2}}{l_{1}}$
4. D.
   $\frac{l_{1} + l_{2}}{l_{1} - l_{2}}$

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1. A.
   $(l_1) : (l_1 + l_2)$
2. B.
   $(l_1) : (l_1 - l_2)$
3. C.
   $(l_1 + l_2) : (l_1)$
4. D.
   $(l_1 + l_2) : (l_1 - l_2)$

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1. A.
   $90$
2. B.
   $81$
3. C.
   $60$
4. D.
   $30$

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1. A.
   $70$
2. B.
   $80$
3. C.
   $65$
4. D.
   $30$

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