191. The length of solenoid A is twice the length of solenoid B, and the number of turns of solenoid A is also twice the number of turns of solenoid B. If the electric current passing through them is equal, the energy stored in solenoid A compared to solenoid B is how many times, and the magnetic field inside solenoid A compared to the magnetic field inside solenoid B is how many times? (The solenoids have no iron core and their cross-sectional area and wire diameter are equal.) (1) 1 and 1 (2) 2 and 1 (3) 2 and 2 (4) 4 and 2
\textbf{191.} The length of solenoid A is twice the length of solenoid B, and the number of turns of solenoid A is also twice the number of turns of solenoid B. If the electric current passing through them is equal, the energy stored in solenoid A compared to solenoid B is how many times, and the magnetic field inside solenoid A compared to the magnetic field inside solenoid B is how many times? (The solenoids have no iron core and their cross-sectional area and wire diameter are equal.)
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(1) 1 and 1 \hspace{1cm} (2) 2 and 1 \hspace{1cm} (3) 2 and 2 \hspace{1cm} (4) 4 and 2
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