explain spdf rule ...
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Answer:
SPDs are designed to limit transient overvoltages due to lightning or switching and divert the associated surge currents to earth.
Answer:These subshells are called as s, p, d, or f. The s-subshell can fit 2 electrons, p-subshell can fit a maximum of 6 electrons, d-subshell can fit a maximum of 10 electrons, and f-subshell can fit a maximum of 14 electrons.
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