Touch with finger

Electricity and Magnetism Level 2

The above shows a capacitive touchscreen panel. As a human body is also an electrical conductor, touching the surface of the screen results in a distortion of the screen's electrostatic field, measurable as a change in capacitance. The above right are simplified circuits before(A) and after(B) touching by finger. The voltages in A and B are the same, which is V. The capacity of C\(_2\) is lager than that of C\(_1\). Which of the following explanations is correct?

a) The voltage for C\(_1\) of [A] is higher than the voltage for C\(_1\) of [B].

b) The voltages for C\(_1\) and C\(_2\) of [B] are the same.

c) C\(_1\) and C\(_2\) of [B] have the same quantity of electric charge.


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