How the force between two parallel wires changes when the currents or the distance change

1. A.
   $1 \times 10^{-3}$ N
2. B.
   $2 \times 10^{-3}$ N
3. C.
   $4 \times 10^{-3}$ N
4. D.
   $0.25 \times 10^{-3}$ N

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

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1. A.
   2 F
2. B.
   F
3. C.
   8 F
4. D.
   4 F

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1. A.
   same, reversed.
2. B.
   twice, reversed.
3. C.
   thrice, same.
4. D.
   twice, same.

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