How does the strength of the magnetic field at the centre of current carrying circular coil depends on the radius of the coil number of turns in the coil and strength of the current flowing in the coil
Answers
Expert Verified. As the number of turns in the coil increases, the strength of the electromagnet increases. This is because of the fact that the higher the number of turns of the coil, the higher the sum of the individual emf s induced by every turn as it 'cuts' through the magnetic field. A wire coil that is carrying a current produces a magnetic field B( r), where r is the distance from the center of the coil to the field point. The strength of the field B is proportional to the current I in the coil. The strength and direction of the field depend on r. ... For large distances, both fields fall off as 1/r3. (i) Magnetic field(B) is inversely proportional to the radius of the coil. (ii) B is directly proportional to the number of turns n of the coil. For each circular turn, the direction of current is same. So, the fields due to the various turns get added up.