the diagram shows a setup for inducing a current in a wire. which change would cause the needle on the…
the diagram shows a setup for inducing a current in a wire. which change would cause the needle on the ammeter to point to the left of the zero? making the wire thicker adding coils to the wire disconnecting the wire from one end of the ammeter moving the wire downward through the magnetic field
Answer
Explanation:
Step1: Understand electromagnetic - induction
According to Faraday's law of electromagnetic - induction, the induced emf (and thus current) in a conductor moving in a magnetic field depends on the rate of change of magnetic flux through the conductor. The direction of the induced current is given by Lenz's law.
Step2: Analyze each option
- Making the wire thicker: This changes the resistance of the wire but not the direction of the induced current. So, it won't make the ammeter needle point to the left.
- Adding coils to the wire: This increases the induced emf (by increasing the number of turns), but it doesn't change the direction of the induced current.
- Disconnecting the wire from one end of the ammeter: This breaks the circuit, and there will be no current flow, so the ammeter needle will go to zero, not to the left.
- Moving the wire downward through the magnetic field: The initial movement is upward. Reversing the direction of the wire's motion through the magnetic field will reverse the direction of the induced emf and current, causing the ammeter needle to point to the left.