For a particular scientific experiment, it is important to be completely isolated from any magnetic field, including the earth's field. the earth's field is approximately 50 μt, but at any particular location it may be a bit more or less than this. a 1.00-m-diameter current loop with 200 turns of wire is adjusted to carry a current of 0.211 a ; at this current, the coil's field at the center is exactly equal to the earth's field in magnitude but opposite in direction, so that the total field at the center of the coil is zero.
what is the strength of the earth's magnetic field at this location?
b =
express your answer to two significant figures and include the appropriate units.

given data:

determine the horse power (h.p) = ?

force applied to move the box(f) = 10 pounds,

box lifted from a distance         (d) = 3 feet

time taken to lift                         (t) = 10 sec,

the horse power is defined as amount of work required to move a load. the horse power is equal to 550 foot-pound per second

                  1 h.p   = 550 foot-pound/second

it can also be defined as the the load that need to be move a body for certain distance in a certain amount of time.

mathematically,

                      h.p = (force × distance)/ time

                            = (10 × 3)/ 10

                            = 30/10

                            = 3 foot -pound/sec

hence, the horse power is needed to move the box is 3 foot-pound/second

important note: 1 h.p = 550 foot-pound/second = 746 watts

area of focus

option number c is the right answer.