Question

Electrons flow from a _____________ charged body to a ______________ charged body when connected by a copper wire.
(A) Positively, positively
(B) Negatively, negatively
(C) Positively, negatively
(D) Negatively, positively

Answer 1

Hint: In metallic conductors, the electrons loosely bound to the atoms are in random motion. These electrons are called free electrons. Free electrons will flow through conducting materials. The net flow of charge at any point will be zero. Here we have to find the charge of the body from which the electron flows and the charge of the body to which the electron flows.

Complete Step by step solution:
Electric current is defined as the flow of charged particles like electrons, protons, etc. across any cross-sectional area of a conductor. In metallic conductors, the current is due to the flow of electrons. Electrons are negatively charged particles. We know that free electrons will be present in a negatively charged body and they flow to a positively charged body. Therefore, here the electrons flow from a negatively charged body to a positively charged body when connected by a copper wire.
Hence option (D) is the correct answer.

Additional Information
The work done in moving a unit positive charge from one end to the other is called the electromotive force. It is the external energy required to drive the free electrons in a definite direction. The unit of electromotive force (emf) is volt or Joule/Coulomb. Current is a scalar quantity. Its unit is ampere.

Note:
Current through a conductor is said to be one Ampere if one Coulomb charge flows through any cross-section in one second. The direction of flow of positive charge is taken to be the direction of flow of current. Therefore we can say that direction of current flow will be in the direction opposite to the flow of electrons.