A power cable carries a 100 A current. At what distance from the wire is the
magnetic field equal to that of the
Earth, 5.00 x 10-5 T?

Unit = m

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s

so easy. just google the electromagnetic waves and it’ll pop up.

c) power lifting, will be your answer.

,

deku ❤