Which of these statements about a current carrying long solenoid is incorrect
a) Magnetic field inside it is uniform for a given current and number of turns
b)Magnetic field inside it increases when current through it is increased
c)Magnetic field inside it decreases when current through it is increased
d)Magnetic field inside it increases when number of turns per unit length of it are increased
Answers
Answer:
The strength of a solenoid can be increased by increasing the number of turns.Higher the number of turns, higher the length and thus the amount of current carrying coil material in use is higher and thus higher the magnetic field due to increased amount of current flowing through the solenoid as a result of the increased number of turns. Magnetic Field is given by firmula B=μNI in which N is number of turns.
A cylindrical Coil of wire whose diameter is small compared to its length is known as a Solenoid. It can be used to generate an essentially uniform Magnetic Field similar to that of a bar Magnet,when a Current is running through it. The Magnetic Field is directed along the axis of the Solenoid.
Image result for The magnetic field due to a solenoid is similar to the magnetic field produced by a bar magnet.
Both the staements are true
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