Medium MCQ +4 / -1 PYQ · JEE Mains 2020

Consider a circular coil of wire carrying constant current I, forming a magnetic dipole. The magnetic flux through an infinite plane that contains the circular coil and excluding the circular coil area is given by $\phi$i. The magnetic flux through the area of the circular coil area is given by $\phi$0. Which of the following option is correct?

  1. A $\phi$<sub>i</sub> = $\phi$<sub>0</sub>
  2. B $\phi$<sub>i</sub> &lt; $\phi$<sub>0</sub>
  3. C $\phi$<sub>i</sub> $&gt;$ $\phi$<sub>0</sub>
  4. D $\phi$<sub>i</sub> = - $\phi$<sub>0</sub> Correct answer

Solution

As, magnetic field lines forms a closed loop, hence each line from circular area will pass through outer area in opposite direction hence $\phi$<sub>i</sub> = - $\phi$<sub>0</sub>.

About this question

Subject: Physics · Chapter: Electromagnetic Induction · Topic: Self and Mutual Inductance

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