The direction of a magnetic field that is generated by a linear current ______?

option(2)

CONCEPT:

• Magnetic field: The vector quantity that describes the magnetic force influenced by the flowing of charge in the conductor.
• The right-Hand thumb rule is used to describe the direction of the magnetic field which is generated by the linear current.

EXPLANATION:

• Whenever the charge flows in the wire, it produces a current which causes the magnetic force experienced by the wire. 
  • To determine the direction of current we use the Right-hand thumb rule.
• Method to find the direction of liner current flow in the right-hand thumb:
  • Put your thumb in the direction of the linear current flow, which will give the direction of the magnetic field
  • Curl your four fingers which will provide you the direction of the magnetic field.

Additional Information

• Ampere's Law: According to this law magnetic field is related to this current which is given by the formula.

B.dl = μ₀I (where B is a magnetic field, dl is small length, μ0 is the permeability in free space and I is the current flowing in it)

• Joule's Law: His principle state that the rate of heat by direct current is directly proportional to the resistance of the circuit and to the square of the current

H = I² RT (where I is current, R is resistance and T is temperature.)