The magnetic field inside a very long solenoid of length L0, radius R0, large number of turns N0, and current I0 is B0. If the length and radius of the solenoid were doubled, while keeping the number of turns and the current the same, the magnetic field inside the solenoid would be:

sleep paralysis is a parasomnia, events associated with sleep.

sleep paralysis happens when you are in the middle of waking up or falling asleep. it is the feeling of being conscious but unable to move. it definitely involves hallucinations.

i had a friend that had sleep paralysis and he told me a story one time where he was laying in bed and he couldn't move his body no matter how hard he tried and there was someone standing in the corner of his room coming towards him. he couldn't move and you can't "wake up" because you are already conscious. sometimes sleep paralysis can be triggered by frequent waking up during the night based off of multiple trips to the bathroom, or if you had ever been abused, sleep paralysis can start happening from things like that.

the answer you are looking for is d. there are no holes for blood to enter or leave the system. your welcome