In a typical living cell, the electric potential inside the cell is 0.070 V lowe

Question

In a typical living cell, the electric potential inside the cell is 0.070 V lower than the electric
potential inside the cell. The thickness of the cell membrane is 0.10 µm. What are the (a)
magnitude and (b) direction of the electric field within the cell membrane?

A tiny sphere carrying a charge of -25.0 nC is moved 100 cm in a uniform electric field with no
acceleration. It goes from a location at a potential of zero to a potential of + 100 V. (a) How much
work is done by the applied force? (b) What is the significance of the sign of ?W?

Explanation / Answer

a) given that the electric potential inside the cell is V=0.070V                             the thickness is d=0.10 x 10-6 m then the electric field is E=V/d                                       =7x 105N/C b)Given that the charge is q=-25 x 10-9C the potential difference is V=100V hence the work done is W=qV                                        =(-25 x 10-9C)(100)                                         =-0.25x10-5J negative sign indicates that work is done againest the electric field

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