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Alisiya [41]
2 years ago
4

A styrofoam ball of mass 0.120 g is placed in an electric field of 6000 n/c pointing downward. What charge must be placed on the

ball for it to be suspended?
Physics
1 answer:
Andreas93 [3]2 years ago
6 0

Answer:

q=-1.96\cdot 10^{-7}C

Explanation:

In order for the ball to be suspended, the electric force on it must be equal to the weight of the ball, so we can write:

qE=mg

where

qE is the electric force

mg is the weight

q is the charge on the ball

E = 6000 N/C is the electric field

m=0.120 g = 0.120 \cdot 10^{-3} kg is the mass of the ball

g=9.8 m/s^2 is the acceleration of gravity

Solving for q, we find the magnitude of the charge:

q=\frac{mg}{E}=\frac{(0.120\cdot 10^{-3})(9.8)}{6000}=1.96\cdot 10^{-7} C

Now we have to determine the direction. We know that:

- The weight points downward, so the electric force must acts upwnward

- The electric field points downward: so, F and E have opposite directions

- This means that the charge is negative

So, the answer is

q=-1.96\cdot 10^{-7}C

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Answer:

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Explanation:

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Cheers!

3 0
2 years ago
Read 2 more answers
Charge q1 is distance r from a positive point charge Q. Charge q2=q1/3 is distance 2r from Q. What is the ratio U1/U2 of their p
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We have that The ratio U1/U2 of their potential energies due to their interactions with Q is

  • U1/U2=6
  • U1/U2=6

From the question we are told that

Question 1

Charge q1 is distance r from a positive point charge Q.

Question 2

Charge q2=q1/3 is distance 2r from Q.

Charge q1 is distance s from the negative plate of a parallel-plate capacitor.

Charge q2=q1/3 is distance 2s from the negative plate.

Generally the equation for the potential energy  is mathematically given as

U=\frac{-k*qQ}{r}

Therefore

The Equations of U1 and U2 is

For U1

U1=\frac{-k*q_1Q}{r}

For U2

U2=\frac{-k*q_1Q}{3*2r}

Since

U is a function of q and  q2=q1/3

Therefore

U1/U2=6

For Question 2

For U1

U1=\frac{-k*q_1Q}{s}\\\\For U2\\\\U2=\frac{-k*q_1Q}{3*2r}

Therefore

U1/U2=6

For more information on this visit

brainly.com/question/23379286?referrer=searchResults

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B is the answer to this truly did the math
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