• 2022-06-16
    一半径r1 = 5 cm的金属球A,带电荷q1 = +2.0×10-8 C,另一内半径为r2 = 10 cm、 外半径为r3 = 15 cm的金属球壳B, 带电荷q2 = +4.0×10-8 C,两球同心放置,如图所示.若以无穷远处为电势零点,则A球电势UA = _________,B球电势UB = ________.[img=107x122]180317982cf97cf.png[/img]