Question

When to use left hand rule and when to use right hand rule in electric

Answer 1

left hand rule is used when you are given magnetic field and current,you need to find the direction of force while right hand rule is used when you are given magnetic field and motion,you need to find direction of current......hope it helps:)

Answer 2

we use left hand rule to find the direction of magnetic field and direction of current.
Imagine you hold a current carrying conductor with right hand then your thumb points towards the direction of current and your fingers will wrap around the conductor in the direction of magnetic field.

we use left hand rule to determine the direction of field,force, current