Point charge attractioning a positive charge from infinity to 30cm

AI Thread Summary
To calculate the work required to bring a positive charge of 4.0 x 10^-9 C from infinity to 30 cm from a point charge of 2.0 x 10^-9 C, the formula W = -q2(ΔV) is used, where ΔV = Ke * q1/d. The user initially misapplied the charge values, switching q1 and q2 without realizing it does not affect the outcome. The final expression for work must be shown clearly, including the values substituted, and the sign of the result should be noted. The discussion emphasizes the importance of correctly applying the formula and understanding the signs in electrostatics.
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Homework Statement



A point charge of 2.0 10-9 C is located at the origin. How much work is required to bring a positive charge of 4.0 10-9 C from infinity to the location x = 30.0 cm?

and it requests the answer in J

Homework Equations



W=-q2(delta)V

DeltaV = Ke q1/d

where delta v is potential difference, W is work, q2 and q1 are the charges, Ke is coulombs constant, and d is distance



The Attempt at a Solution



I plugged in all of the variables using 4.0 *10 ^ -9 as my q1 and 2.0*10^-9 as my q2 and that was wrong so i switched them.. again wrong..
 
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Switching q1 and q2 won't change anything. Show your final expression for the work done and the numbers you plugged in. Is it positive or negative?
 
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