The question asks about the conventional direction indicated by electric field lines. To answer this, we need to recall the definition and properties of electric field lines, particularly how they relate to the force experienced by a charge in the field.
Correct Option: B) The direction of the force that would act on a positive test charge placed in the field
The question asks for the definition of electric current. We need to recall the fundamental definition of electric current in physics.
Correct Option: D) Electric current is defined as the rate of flow of Electric charge.
The question asks for the SI unit of electric current. To answer this, we need to recall the fundamental SI units for various electrical quantities.
where \(I\) is the current, \(Q\) is the electric charge, and \(t\) is the time.
C) Ampere is the SI unit of electric current.
The question asks to identify the actual physical carriers of electric current in most conductors, particularly metals. This requires understanding the basic principles of electrical conductivity in materials.
Correct Option: D) Free (conduction) electrons
In metals, the outermost electrons (valence electrons) are not bound to specific atoms but are free to move throughout the entire metallic structure. These are called free electrons or conduction electrons. When a potential difference is applied, these electrons move in a directed manner, creating an electric current. This is why metals are good conductors of electricity.
The question asks about the key condition that must remain constant for Ohm's Law to be valid. Ohm's Law describes the relationship between voltage, current, and resistance. We need to identify which physical property of the conductor significantly affects its resistance and thus needs to be kept constant for the law to hold true.
Correct Option: C) The temperature of the conductor
The question asks for the best understanding of electrical resistance, given its definition \(R = V/I\). We need to analyze the fundamental concept of resistance in the context of electric current flow.
Correct Option: A) A conductor's opposition to the flow of electric current through it