Question

In the sign convention for Ampere's law, if the fingers of the right hand curl along the direction of integration (\[d\vec{l}\]), the thumb points:

Options

• Opposite to the direction of the current

• In the direction of the magnetic field \[\vec{B}\]

• In the direction of positive current

• Radially outward from the loop

Answer 1

Curling the fingers of the right hand along the direction of integration (\[d\vec{l}\]) makes the thumb point in the direction of positive current. This convention assigns signs to currents enclosed by the loop.