Question

State right hand thum rule for finding direction of magneric field around a current carrying straight conductor . how will the field be affected on increasing current and on changing direction of flow of current

Answer 1

The right hand thunb 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.

If we increase the magnitude of the current, the radius of the magnetic field will also increase.
If the direction of the flow of the current is reversed, the direction of the magnetic field also gets changed.