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A bug zapper consists of two metal plates connected to a high-voltage power supply. The voltage between the plates is set to give an electric field slightly less than 1×106 V/m . When a bug flies between the two plates, it increases the field enough to initiate a spark that incinerates the bug.

If a bug zapper has a 7000 V power supply, what is the approximate separation between the plates?

(a) 7 × 10^-2 cm

(b) 0.7 cm

(d) 70 cm

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