## Mashy 3 years ago Problem on 3 straight wires carrying current..Please see the attachment and help me out

1. Mashy

I believe.. regardless of what the current direction or for that matter the magnitude in the middle wire is, the answer should be zero! . But not in the options!

2. Mashy

I think the problem is wrong, it should be calculate the force on the conductor C

3. Mashy

Please check this one http://faculty.kfupm.edu.sa/phys/kuhaili/PHYS102Exams_T111/Chapter29.pdf question number 23.. even that is wrong ?.. cause regardless of what direction or magnitude current is.. net force has to be zero!

4. Ishaan94

no, if current in wire 2 is in the opposite direction to current in wire 1. the net force on 3 would be zero.

5. Ishaan94

But you also need a certain magnitude to make it zero.

6. Mashy

No the question is, what is the net force on WIRE 2, the middle wire.. As long as the current in side 2 wires are same and in same direction, the force on wire 2 will always be zero!

7. Ishaan94

$\frac{\mu L I_2}{2\pi \cdot \frac12 } = \frac{\mu L I_1}{2\pi \cdot 1} \implies I_2 = \frac{I_1}{2}$

8. Ishaan94

Hmm you said Q23 right?

9. Ishaan94

10. Ishaan94

Q.23

11. Ishaan94

mashy?

12. Mashy

yea one second m here!!!

13. Mashy

oh yea.. in the question 23 its the WIRE 3.. correct.. there also i read as wire 2.. I am sorry!!.. you are right .. !!

14. Ishaan94

ohh okay. so you have decided to get in physics? or these questions are for college test?