When You Double the Number of Windings in an Ideal

Multiple Choice

When you double the number of windings in an ideal solenoid while keeping all other parameters (radius, length and current) fixed, the magnetic field at the center of the solenoid will

A) triple.
B) double.
C) be reduced by a factor of one-fourth.
D) quadruple.
E) be reduced by a factor of one-half.