Charge and surface charge density on spheres at the same potential (touched or connected)

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

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

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1. A.
   $\dfrac{1}{9}$
2. B.
   $9$
3. C.
   $\dfrac{1}{3}$
4. D.
   $3$

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1. A.
   $9 : 4$
2. B.
   $4 : 3$
3. C.
   $5 : 3$
4. D.
   $5 : 6$

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1. A.
   $Q(r + r_1)$
2. B.
   $Q(r - r_1)$
3. C.
   $\dfrac{Q}{(r + r_1)}$
4. D.
   $\dfrac{Qr_1}{(r + r_1)}$

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1. A.
   $\dfrac{a^2}{b^2}$
2. B.
   $\dfrac{b^2}{a^2}$
3. C.
   $\dfrac{b}{a}$
4. D.
   $\dfrac{a}{b}$

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