Question

The strength of a magnetic field follows _____.



an inverse square law

the law of domains

Coulomb's law

the law of poles

Answer 1

Will give medals!(:

Answer 2

Hint:
The magnetic field lines for infinitely long straight wire
\[B = \frac{ \mu _0 I }{ 2 \pi } \times \frac{ 1 }{ r }\]