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Q: By which electric current in a circuit is possible?
  • A. neutron speed
  • B. positron speed
  • C. motion of protons
  • D. motion of electrons
Correct Answer: Option D - The electric current in a circuit is made possible by the a motion of free electron. The rate of flow of electric charge in a conductor is called electric current. The direction of electric current is considered to be towards the direction of positive charge. Its S.I. unit is ampere.
D. The electric current in a circuit is made possible by the a motion of free electron. The rate of flow of electric charge in a conductor is called electric current. The direction of electric current is considered to be towards the direction of positive charge. Its S.I. unit is ampere.

Explanations:

The electric current in a circuit is made possible by the a motion of free electron. The rate of flow of electric charge in a conductor is called electric current. The direction of electric current is considered to be towards the direction of positive charge. Its S.I. unit is ampere.