The ratio of the lengths and the number of turns of the two long solenoids A and B are 1 : 2 and 2 : 1 respectively. If the magnetic field produced in both the solenoids is the same then find the ratio of the current in solenoid A to solenoid B.
1
1 : 1
2
4 : 1
3
1 : 4
4
None of these