Question

Which of the following statements is not true?
(1) The pattern of the magnetic field around a conductor
due to an electric current flowing through it depends
on the shape of the conductor
(2) The magnetic field of a solenoid carrying a current is
similar to that of a bar magnet
(3) Magnitude of magnetic field is directly proportional to
the quantity of current flowing through the current
(4) Magnetic field produced by the passage of current
through a straight wire is permanent​

Answer 1

Answer:

option 4 is the wrong one