23. (a) All the charge is the same distance Rfrom C, so the electric potential at Cis (in SI units) 9121112006515(8.99 10 )(4.20 10)2.30 V,448.20 10QQQVRRRεε−−××ªº=−= −= −= −«»×¬¼ππwhere the zero was taken to be at infinity. (b) All the charge is the same distance from P. That distance is
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