Question

Select the true statement regarding magnetism and the Earth's magnetic field.
1-Opposite poles attract.
2-The magnetic field does work on a charge only when the charge has a velocity component perpendicular to the magnetic field.
3-The magnetic field does work on a charge only when the charge has a velocity component parallel to the magnetic field.
4-The Earth's magnetic field lines are parallel to the Earth's surface at all points.
5-Both A and B are true.

Answer 1

I am pretty sure that option 1 is correct..
Regarding option 2 what i know is that magnetic field applies force on charge when charge has velocity component perpendicular to magnetic field but since that force always acts perpendicular to the velocity of charge now work is done..
So, option 1 is correct..

Answer 2

1

Answer 3

thank u 4 all :D i will choose 1

Answer 4

*no

Answer 5

I meant to write "no" but i wrote "now" in my answer..

Answer 6

ok wait u answer

Answer 7

huh?

Answer 8

are u answer is 1?
or u have another answer

Answer 9

My answer is option 1..

Answer 10

ok thank u :D