Not only do ferromagnetic materials respond strongly to magnets (the way iron is attracted to magnets), they can also be magnetized themselves—that is, they can be induced to become magnetic or made into permanent magnets. ... In an unmagnetized ferromagnetic object, domains are small and randomly oriented.
Force on a proton when they are moving inside the magnetic field is given by
so here while protons are going upwards we can say its direction of velocity is towards +Y and magnetic field is towards us which is along +Z direction so they will have force due to this motion.
As per above equation of force we can have direction of force which is along +X direction.
So here both proton will bend towards +X direction and start moving in curved path.
45° × π/180 = 0,7854 rad
ω = θ /t
ω = 0.7854 / 0.75 = 1.0472 rad/s
I looked up the speed of sound in water ... you could have done it,
but I did it for you. It said 1,484 m/s ... I don't know if that's for fresh
water or sea water, but for 5 points I'm not going to worry about it.
Time = (800 meters) x (1 sec / 1,484 meters)
= (800 x 1,484) seconds
= 0.539 second . (rounded)
The first choice on the list is the closest one.