question_answer

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? [JEE MAIN Held on 07-01-2020 Morning]

A) \[{{\phi }_{i}}=-{{\phi }_{0}}\]

B) \[{{\phi }_{i}}<{{\phi }_{0}}\]

C) \[{{\phi }_{i}}={{\phi }_{0}}\] 

D) \[{{\phi }_{i}}>{{\phi }_{0}}\]

Correct Answer: A

Solution :

[a] Magnetic field lines form close loop. \[{{\phi }_{i}}=-{{\phi }_{0}}\]