om/ibiscms/mod/ibis/view.php?id 4930847 Jump to... 2/10/2018 1 1:59 PM 5.6/100 C

Question

om/ibiscms/mod/ibis/view.php?id 4930847 Jump to... 2/10/2018 1 1:59 PM 5.6/100 Calculator Grade Question 2 of 18 Sapling Learing Map an external force to move a charge from a potential of 7.0 V to a potential of 3.0 V, what is the change in electric potential energy? O 15.0J O 4.0J O 22.0J O 4.0J O 19.0J For the situation given above, what is the potential ifference across which the charge is moverd? O 19.0V O 15.0 V O 22.0 V O 4.0V Using the electric potential energy and potential difference determined above, calculate the charge O 0.18 C O 5.5c O 0.18 C O 5.5c

Explanation / Answer

Solution:

Let us go to the basics first.

By definition, the electrostatic potential energy, U, of one point charge q at position r is defined as the negative of the work W done by the electrostatic force to bring it from the reference position rref to that position r.

Thus, Answer=> Option 3 (22 J)  

Potential difference = Final Potential - Initial potential = 3 - 7 = -4 V (Answer ==> option 5)

charge = Electric potential energy / Potential difference = 22  / -4  = - 5.5 C (Answer ==> option 2)

Thanks!!!

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