contestada

Two cables of the same length are made of the same material, except that one cable has twice the diameter of the other cable. When the same potential difference is maintained across both cables, which of the following statements are true? (There may be more than one correct choice.)
1.The same current flows through both cables.
2. The current in the thin cable is four times as great as the current in the thick cable.
3. The current in the thin cable is twice as great as the current in the thick cable.
4. Both cables carry the same current density.
5. The electrons have the same drift velocity in both cables.

Respuesta :

pstnonsonjoku

The cross- sectional area of a cable determines is resistivity.

According to Ohm's law, the voltage across a wire is dependent on the current and the resistance of the wire. Hence; V = I/R

  • I = current
  • R = resistance

Since the resistance of the wire also depends on the cross- sectional area of the wire, the following statements are true;

  • The current in the thin cable is four times as great as the current in the thick cable.
  • The electrons have the same drift velocity in both cables.

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