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  • A straight section PQ of a circuit lies along the X-axis from =<img alt="-\frac{a}{2}" src="https://learn.careers360.com/latex-imag

A straight section PQ of a circuit lies along the X-axis from x =-\frac{a}{2}   to x = \frac{a}{2} and carries a steady current i. The magnetic field due to the section PQ at a point X=+a will be

Option: 1

Proportional to a


Option: 2

Proportional to a^{2}


Option: 3

Proportional to \frac{1}{a}


Option: 4

Zero


Answers (1)

best_answer

As we learned

Magnetic field due to Current Element -

If \Theta = 0^{^{\circ}} or \Theta = \pi 

\sin \Theta = 0

- wherein

Thus field at a point on the line of wire is zero. 

 

  Magnetic field at a point on the axis of a current carrying wire is always zero.

 

Posted by

Kuldeep Maurya

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