Which of the following statement(s) is/are incorrect?
Options:
(a) In a solenoid, the net magnetic field is the vector sum of the fields due to all the turns.
(b) Enamelled wires are used for winding, so that turns are insulated from each other.
(c) The field inside the solenoid approaches zero and everywhere outside becomes parallel to the axis.
(d) The solenoid is commonly used to obtain a uniform magnetic field.