Two long wires are hanging freely. They are joined first in parallel and then in series and then are connected with a battery. In both cases, which type of force acts between the two wires

 

  • Option 1)

     Attraction force when in parallel and repulsion force when in series

     

  • Option 2)

     Repulsion force when in parallel and attraction force when in series

     

  • Option 3)

    Repulsion force in both cases

     

  • Option 4)

    Attraction force in both cases

     

 

Answers (1)

As we learnt in 

Force between two parallel current carrying conductors -

F=\frac{\mu }{4\pi } \frac{2I_{1 I_{2}}}{a} l

\frac{F}{l}=\frac{\mu o}{4\pi } \frac{2I_{1 I_{2}}}{a}

- wherein

I1 and I2 current carrying two parallel wires 

a-seperation between two wires 

 

When they are connected in parallel the current flowing through both are in same direction hence they attract each other. when they are in parallel they will tend to repel each other


Option 1)

 Attraction force when in parallel and repulsion force when in series

 

correct

Option 2)

 Repulsion force when in parallel and attraction force when in series

 

incorrect

Option 3)

Repulsion force in both cases

 

incorrect

Option 4)

Attraction force in both cases

 

incorrect

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