Which of the following statements about the electric force between two charged objects is true?
As the charges get larger, the strength of the electric force gets smaller.
As the distance between the charges decreases, the strength of the electric
force gets smaller.
As the charge gets larger, the strength of the electric force gets larger.
The strength of the electric force is not affected by how far apart the charges
are.

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answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.