Question

State right hand thumb rule to find the direction of magnetic field around a straight conductor carrying current. How will this magnetic field be affected on:
(a) increasing the current through the conductor,
(b) changing the direction of flow of current through the conductor?

Answer 1

Dear student,
The right hand thumb rule states that If we hold a current carrying conductor in our right hand such that our thumb represents the direction of the flow of current, then the direction of the folded finger will represent the direction of the magnetic field.
(a) If we increase the magnitude of the current, the radius of the magnetic field will also increase.
(b) If the direction of the flow of the current is reversed, the direction of the magnetic field also gets changed.
Regards.