Which of the following forces is produced when a battery causes an electric current to flow through a circuit made of copper wire?

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Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?

Achild has maximum walking speed of 1.6 m/s. what is the length of the child's legs? 0.26 m