Suppose that after walking across a carpeted floor you reach for a doorknob and

Question

Suppose that after walking across a carpeted floor you reach for a doorknob and just before you touch it a spark jumps 0.80 cm from your finger to the knob.

Part A

Find the minimum voltage needed between your finger and the doorknob to generate this spark. The minimum field that can produce a spark in air is 3.0×106V/m .

Express your answer using two significant figures.

Suppose that after walking across a carpeted floor you reach for a doorknob and just before you touch it a spark jumps 0.80 cm from your finger to the knob.

Part A

Find the minimum voltage needed between your finger and the doorknob to generate this spark. The minimum field that can produce a spark in air is 3.0×106V/m .

Express your answer using two significant figures.

Explanation / Answer

given that

Emin = 3*10^(6) V / m

r = 0.80cm

minimum voltage = Emin * r

V = 3*10^6 *0.80*10^(-2)

V = 2.4*10^4

V = 24000 V

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