Chapter 35, Problem 1PLA

To determine

The statement of right-hand rule.

Answer to Problem 1PLA

Right-hand rule states that if the thumb represents the direction of the current then the four finger represents the curl in the direction of the $B$ field.

Explanation of Solution

The lines of magnetic induction $B$ in an infinitely long straight wire with current $I$ are concentric circles surrounding the wire.

The right-hand rule relates the direction of the lines of magnetic field near a long straight wire to the direction of the current in the wire is if the thumb represents the direction of the current in the wire than the four finger of the right hand would represent the curl in the direction of the magnetic field.

Conclusion:

Right-hand rule states that if the thumb represents the direction of the current then the four finger represents the curl in the direction of the $B$ field.