Question

Alguém que me ajude por favor

Answer 1

Explicação:

21)

Letra C

22)

$fel = \frac{k \times q1 \times q2}{ {d}^{2} }$

$fel = \frac{9 \times {10}^{9} \times 8 \times {10}^{ - 6} \times 8 \times {10}^{ - 6} }{ {0.3}^{2} }$

$fel = \frac{9 \times 64 \times {10}^{ - 3} }{9 \times {10}^{ - 2} }$

$fel = 6.4 \: n$

Letra A

23)

$fel = \frac{k \times q1 \times q2}{ {d}^{2} }$

$fel = \frac{9 \times {10}^{9} \times 4 \times {10}^{ - 6} \times 4 \times {10}^{ - 6} }{ {(4 \times {10}^{ - 1}) }^{2} }$

$fel = \frac{9 \times 16 \times {10}^{ - 3} }{16 \times {10}^{ - 2} }$

Fel= 0,9 N

24)

$fel = \frac{k \times q1 \times q2}{ {d}^{2} }$

$9 \times {10}^{ - 1} = \frac{9 \times {10}^{9} \times 5 \times {10}^{ - 6} \times q }{ {0.5}^{2} }$

$9 \times {10}^{ - 1} = \frac{45 \times {10}^{3} \times q }{0.25}$

$2.25 \times {10}^{ - 1} = 45 \times {10}^{3} \times q$

$q = \frac{225}{45}$

Q= -5 C