Question

A line carrying current of finite length is along z-direction. The direction of magnetic field intensity is

• A. along ${\hat{a}}_2$ direction
• B. along ${\hat{a}}_r$ direction
• C. along ${\hat{a}}_p$direction
• D. along ${\hat{a}}_{\varphi }$ direction

Answer 1

The correct option is D along ${\hat{a}}_{\varphi }$ direction

By right hand thumb rule, the direction of magnetic field intensity is along $a_{\varphi }$ direction.