subject : physics

Electric Potential Energy V is a scalar and it must have units of J/C. 1 volt = 1 V = 1 J/C Three charges are arranged at the corners of a rectangle as indicated in the -6.1 AC +27AC diagram at right. 1 21 The work required to move all three charges to infinity is equal to the change in the total electric potential energy of all three charges, This -0.16 m energy is the sum of terms like ( = kq,q;/r for each pair of charges in the system, as illustrated in active example 20-3. Sum the potential energies -3.3 AC 3 for each of the three pairs of charges in this system to find the work required to move all of them infinitely far from one another. -0.25 m Let my = \\(0.25m) +(0.16m) =0.30m. 1. Find AU by summing the terms from W =AU =0_kq:92 k919, kq.9 9.9 9.9 9:91 each pair of charges: 2. Factor out 10"C' from each product of charges and calculate : 1. An electron is accelerated from rest to through a potential difference 12 V. What is the change in electric potential energy of the electron ? Known The charge on an electron (e) = -1.60 x 10 Coulomb Electric potential = voltage (V) = 12 Volt Wanted : The change in electric potential energy of the electron (APE) Solution : APE = q V=