4.Rank the potential energies of the four systems of particles shown in the figu

Question

4.Rank the potential energies of the four systems of particles shown in the figure below from largest to smallest. Include equalities if appropriate. 2pts 20 2- Q 2r 5.The ammeter shown in the figure below reads 2.00 A. Find (a) /1, (b) 12, and (c) e. 3pts 15.0 V 7.00 ? 5.00 n 2.002 & 6.A thin copper rod 1.00 m long has a mass of S0.0 g. What is the minimum current in the rod that would allow it to levitate above the ground in a magnetic field of magnitude 0.100 T? (a) 1.20 A (b) 2.40 A (c) 4.90 A (d) 9.80 A (e) none of those answers. 2pts

Explanation / Answer

here,

4)

a)

the potential energy of system , Va = K * Q * 2 * Q /r

Va = 2 * K * Q^2 /r

b)

the potential energy of system , Vb = K * (-Q) * (-Q) /r

Vb = K * Q^2 /r

c)

the potential energy of system , Vc = K * (-Q) * Q /2r

Vc = - K * Q^2 / 2r

d)

the potential energy of system , Vd = K * -Q * -2 * Q /2r

Vd = K * Q^2 /r

so, ranking is Vc < (Vb = Vd) < Va

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