In an electrical circuit, the ammeter reading decreases to ________________ when the length of the wire is doubled.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. one-half.
In an electrical circuit, the ammeter reading decreases to half when the length of the wire is doubled. This is due to the fact that the resistance of a wire is directly proportional to its length. When the length of the wire is doubled, the resistance also doubles. According to Ohm's law (V = IR), if the resistance increases and the voltage remains constant, the current (which is measured by the ammeter) decreases, typically to half of its original value.