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![[Post New]](/templates/default/images/icon_minipost_new.gif) 17 Jul 2008 20:50:44 IST
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Q19- I think U must be dividing the current as i/2 and i/2. That's wrong.
The current will be divided as 3i/4(thru side AB) and i/4(thru the rest of the square). This is becoz while distrubuting current, its obvious to suppose that wire has some resistance and resistance in part ADCB is thrice of the resistance in the part AB. So current will get divided accordingly.
Now, the mag. field in downwards and upwards direction is equal and U get net field = 0.
Hope U get it.
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