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If the strength of the magnetic field at A is 10 units, the strength of the magnetic field at B is


A)640 units
B)6.4 units
C)2.5 units
D)1.25 units

If the strength of the magnetic field at A is 10 units the strength of the magnetic field at B isA640 unitsB64 unitsC25 unitsD125 units class=

Respuesta :

budwilkins
Strength or Intensity is the inverse-square of distance, thus I = 1c/d2, where c is a constant
So I(A) = 10, 10 = 1c/(2m)2 = c/4
10 = c/4, c = 40
Now distance of B is 4m, so strength of B:
[tex]I(B) = \frac{1c}{ {d}^{2} } = \frac{40}{ {4}^{2} } \\ I(B) = \frac{40}{16} = \frac{5}{2} = 2.5 \: units[/tex]
Answer: C) 2.5 units
2.5 units is the answer i just answered it right now aha,

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