D) Two point charges (t-625 nC and -12.5 nC) are separated by 25 cm as shown in

Question

D) Two point charges (t-625 nC and -12.5 nC) are separated by 25 cm as shown in the figure. What would be the magnitude (in N) and direction of the electric force this combination of charges would produce on a proton at point 8? Round your answer to 2 decimal places and use scientific notation 6.25 nC -12.5 nC 10.0 cm 10.0 cm 25.0 cm When a potential difference is placed across a resistor made of a solid cylindrical block of aluminum, the current through it is / 3.2 A. If the diameter of the resistor is decreased by a factor of 2.6, what is the new current (in A)? Round your answer to 3 decimal places. 2)

Explanation / Answer

1) Electirc field at B due to -6.25 nC

= kqr^2

=9*10^9*6.25*10^-9 / 0.1^2

= 5625 N/C (to the right)

EF at B due to -12.5 nC = 9*10^9*12.5*10^-9 / 0.35^2

= 918.36 N/C (to the right)

Net EF at point B = (5625 + 918.36) = 6543.36 N/C (to the right)

force = qE = 1.6*10^-19*6543.36 = 1.04*10^-15 N ( to the right)

2) I = V/R

I = V/ pL/A

I = Vpi*r^2 / pL

all the factors remains smae except the radius

I1/I2 = (r1/r2)^2

3.2 / I2 = (2.6)^2

I2 = 0.47 A

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