Electrical Energy and Capacitance4316.9(a) Use conservation of energy ()sefiKEPEPEKEPEPE++=++(or )()()0KEPEPE∆+∆ +∆ =()0KE∆=since the block is at rest at both beginning and end. 2max102sPEkx−maxx(, where is the maximum stretch of the spring. )maxePEWQE x−=−Thus, 2maxmax12kxQE x+−=00, giving ( )( )655.0010Vm0.500 mN m××=max250.0 C2100QExk−==±²±³±²±³±²(b) At equilibrium, Σ=Therefore, 0, or 0eqFFFkxQE− + =−+=10.250 m2eqmaxQExxk=Note that when the block is released from rest, it overshoots the equilibrium
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