a student draws the following diagram representing A student

A student draws the following diagram representing the magnetic field generated by a straight current-carrying wire There is at least one problem with the diagram. Identify any problems and explain how to correct them.

Solution

The direction of the magnetic field due to moving charges will depends on the right hand rule.

For the case of a long straight wire carrying a current i ,the magnetic field lines wrap around the wire.By pointing one\'s right thumb along the direction of the current,the direction of the magnetic field can by found by curving one\'s fingers arounf the wire.

In the figure the direction of magnetic field is into the page.But from right hand rule it is out of the page.