JEE PYQ: Magnetic Effects Of Current Question 24
Question 24 - 2020 (07 Jan 2020 Shift 1)
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) $\phi_i = \phi_0$
(2) $\phi_i > \phi_0$
(3) $\phi_i < \phi_0$
(4) $\phi_i = -\phi_0$
Show Answer
Answer: (4) $\phi_i = -\phi_0$
Solution
As magnetic field lines form closed loops, the flux through the coil area and the flux through the rest of the infinite plane are equal and opposite. Therefore $\phi_i = -\phi_0$.
BETA
