A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved,the new value of the magnetic field is____________
A. B/2
B. B
C. 2B
D. 4B
Answer:B
A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved,the new value of the magnetic field is____________
A. B/2 B. B C. 2B D. 4B