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  • One of the two small circular coils, (none of them having any self - inductance) is suspended with a V - shaped copper wire, with plane horizontal. The other coil is placed just below the first one

One of the two small circular coils, (none of them having any self - inductance) is suspended with a V - shaped copper wire, with plane horizontal. The other coil is placed just below the first one with plane horizontal. Both the coils are connected in series with a dc supply. The coils are found to attract each other with a force. Which one of the following statements is incorrect ? 

Option: 1

Both the coils carry currents in the same direction. 


Option: 2

Coils will attract each other, even if the supply is an ac source. 


Option: 3

Force is proportional to d-1 ; d = distance between the centres of the coils. 


Option: 4

Force is proportional to d-2 


Answers (1)

best_answer

Let the force between them be F

  As the force between the two coils is attractive hence currents in the coil must be in the same direction

and  F \propto \frac{I_{1} I_{2}}{2 \pi d}

where I_1 \ and \ I_2are the currents flowing through the coils.

Posted by

Gautam harsolia

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