一电容器由两个很长的同轴薄圆筒组成,内、外圆筒半径分别为R1 = 2 cm,R2 = 5 cm,其间充满相对介电常量为er 的各向同性、均匀电介质.电容器接在电压U = 32 V的电源上,(如图所示),试求距离轴线R = 3.5 cm处的A点的电场强度和A点与外筒间的电势差.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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