At what distance from a long, straight wire carrying a current of 8.7 a is the magnetic field due to the wire equal to the strength of earth’s field, approximately 5.4 × 10−5 t? the permeabilty of free space is 1.25664 × 10−6 t · m/a. answer in units of cm.

r= 3.2 cm

Explanation:

Given that

I= 8.7 A

B= 5.4 x 10⁻⁵ T

μo=1.25664 x 10⁻⁶

We know that magnetic filed in wire at a distance r given as

By putting the values

r=0.032 m

r= 3.2 cm

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.