Which of the following statements is true about the flow of electrons in an electric circuit?

  • A
    Electrons always flow from lower to higher potential
  • B
    Electrons always flow from higher to lower potential
  • C
    Electrons flow from lower to higher potential,except through power sources
  • D
    Electrons flow from higher to lower potential,except through power sources

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$A$ current of $5\,A$ flows through a resistance of $10\, \Omega$ for $4$ minutes. The total charge in Coulombs and the number of electrons passing through any cross-section of the resistor in this time are, respectively:

The charge flowing in a conductor varies with time as $Q = at - bt^2$. Then for current,which statement is incorrect?
$(A)$ decreases linearly with time
$(B)$ reaches a maximum and then decreases
$(C)$ falls to zero after time $t = a/2b$
$(D)$ changes at a rate $-2b$

Define the $SI$ unit of electric charge in terms of the Ampere.

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