Solenoid #1 has a length L, cross-sectional area A, and N turns. Solenoid #2 has a length 2L, cross-sectional area 2A, and 2N turns. Which long solenoid has the greater magnetic field at its center when equal currents are going through them?
a. Both have the same magnetic field. b. #1
c. #2
d. Since it depends on the values of A and L, none of the above are correct.
A
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