Which of the following statements are true regarding Biot – Savart’s law?
(i) According to biot – savart’s law magnetic field is directly proportional to the length of the element.
(ii) Biot – Savart’s law deals with electric field.
(iii) Magnetic field is directly proportional to current through the conductor.1
Only (i) is true
2
Only (i) and (ii) are true
3
Only (i) and (iii) are true
4
All are true