I had these questions a while ago, but I was confused by how to do it. Thank you

Question

I had these questions a while ago, but I was confused by how to do it. Thank you for the help!

1. Two large parallel metal plates have a potential difference of 350V between them. If the electric field between the plates is 2.9 x 10^4 N/C, what is the electric force expeienced by an electron between the plates?

A. 5.5 x 10^-24 N

B. 4.6 x 10^-22 N

C. 5.6 x 10^-17 N

D. 4.6 x 10^-15 N

2. The diagram attached shows a circuit. In which resistor will the power dissipated be greatest?

A. 200

B. 270

C. 230

D. The power dissipated in each resistor will be the same.

3. In the circuit (diagram attached), which of the following changes would cause the greatest increase in the current through the 6 ohm resistor?

A. Removing the 2 ohm resistor.

B. Connecting the 2 ohm resistor between points X and Y.

C. Removing the 12 ohm resistor.

D. Connecting another 12 ohm resistor between points X and Y.

Explanation / Answer

Answer:

Given:-

1) dV = 350 V

E = 2.9 x 10^4 N/C

As we know,

F = qE, where both F and E are vector quantities and q is a scalar quantity.

F = q E= (1.6 x 10^-19 C) * (2.9 x 10^4 N/C)

F = 4.64 x 10^-15 N (option D is right)

2. As we know, P=V^2/R

So, lower value of R dissipates more power.

Option A is right.

3.

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