A 41-m length of wire is stretched horizontally between two vertical posts. The wire carries a current of 82 A and experiences a magnetic force of 0.13 N. Find the magnitude of the earth's magnetic field at the location of the wire, assuming the field makes an angle of 61.0° with respect to the wire.

The magnitude of the earth's magnetic field at the location of the wire is 4.42 × 10^-5 T

Explanation: Please see the attachments below

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle