Answer:
I think no 3 is false
and 4 is true
and the the ones you did are correct
if wrong correct me pls
According to the right-hand thumb rule, the forefinger gives the velocity of charge, the thumb gives the magnetic force and the center finger gives the direction of magnetic field.
then, as shown in the picture, the <span>direction of the magnetic force on the charge is in the right direction.</span>
I think it’s R=U/I = 120/5 = 24
It will be a red giant for about 5 billion years