Test Pencil

Electricity and Magnetism Level 2

On a rainy day,a man wearing rain shoes touch the power line with the test pencil（Voltage Tester . Pencil will light if there is a current flowing through it）.Assume that the insulation of the rain shoes is great.Question is "Will the pencil light? "

Yes No

Kirigaya Kazuto by Kirigaya Kazuto , 20, China

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2 solutions

Kirigaya Kazuto
Oct 1, 2018

Your shoe is equivalent to a capacitor,and the alternating current is still allowed in the circuit（Don't tell me you're still using direct current）

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Michael Mendrin
Sep 17, 2018

It's generaly pretty dangerous to try to directly measure the current of a main power line, unless one uses a non-contact capacitive test pencil, which measures the changing electric field of an AC current. Then no circuit "needs to be completed", and everything can be insulated for sake of safety.

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