Question

The magnetic field strength at $1,2,$ and $3$ in the following picture is in the order:

• A. $1=2=3$
• B. $1>3>2$
• C. $1>2>3$
• D. $3>2>1$

Answer 1

The correct option is C $1>2>3$

The strength of the magnetic field at a point is directly proportional to the number of magnetic field lines in that area. In the figure, the magnetic field lines are closest to each other at point $1$ than at point $2$ and $3$. The magnetic field lines are wider at point $3$ than point $2$. Hence, the magnetic field strength is higher at point $2$ than point $3$. The magnetic field strength is in order of $1>2>3$.