Which of the following is true for the direction of an electric field? a.
It is same as the direction of the force exerted on a negative test charge.
b.
It is opposite to the direction of the force exerted on a positive test charge.
c.
It is same as the direction of the force exerted on a positive test charge.
d.
It is opposite to the direction of the force exerted on a neutral test charge.

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A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.