MasteringPhysics: HW 2-Google Chrome Secure | https://session.masteringphysics.c

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MasteringPhysics: HW 2-Google Chrome Secure | https://session.masteringphysics.com/myct/itemView?assignmentProblemID-80660917&offset-next; HW2 Problem 20.59 « previous | 7 of 10 | next » Problem 20.59 Part A k Suppose that after walking across a carpeted floor you reach for a doorknob and just before you touch it a spark jumps 0.75 cm from your finger to the knob. 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 × 106 V/m. Express your answer using two significant figures spark nirs 0oe you reach for a do Submit My Answers Give Up Provide Feedback Continue

Explanation / Answer

the minimum voltage needed between your finger and doorknob to generate this park is

V = E*d

= (3.0*10^6)(0.75*10^-2)

= 22500 V

rounding to two significant figures voltage V = 22000 V

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