True orFalse? 1. The current is zero in a conductor when no potential difference

Question

True orFalse?
1. The current is zero in a conductor when no potential differenceis applied to it because equal number of electrons and protons aremoving together.

2. Two wires made of different materials have the same uniformcurrent density. They carry the same current if the potentialdifferences across them are the same.
3. If J is the vector representing the current density anddA is a vector element of area, then the integralJ·dA over an area represents thecurrent through the area.

4. In a conductor carrying a current the electron drift speed ismuch greater than the speed of the random motion ofelectrons.
5. The current density is the same in two wires. Wire A has twicethe free-electron concentration (number of electrons per unitvolume) of wire B. The drift speed of electrons in A is twice thedrift speed of electrons in B. True orFalse?
1. The current is zero in a conductor when no potential differenceis applied to it because equal number of electrons and protons aremoving together.

2. Two wires made of different materials have the same uniformcurrent density. They carry the same current if the potentialdifferences across them are the same.
3. If J is the vector representing the current density anddA is a vector element of area, then the integralJ·dA over an area represents thecurrent through the area.

4. In a conductor carrying a current the electron drift speed ismuch greater than the speed of the random motion ofelectrons.

Explanation / Answer

1)false(statement is correct but reasoning is wrong) 2)true 3)true 4)false 5)false

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