Final answer:
Leisha can use modifications like a current direction switch, a Hall effect sensor, and a controlled environment to observe how reversing electric current affects magnetic force in an electromagnet. She can apply right-hand rules and concepts like Faraday's law of induction and Lenz's law to understand her results.
Step-by-step explanation:
Leisha's investigation into electromagnetism can involve several modifications to observe the effects of changing the direction of electric current on magnetic force. Here are some potential modifications Leisha could use:
- Use a switch to reverse the direction of the current in the electromagnet circuit.
- Implement a Hall effect sensor to measure the magnetic field strength and direction.
- Set up a controlled environment where external magnetic fields are minimized.
Each of these modifications serves a distinct purpose:
- The switch allows for quick changes in current direction, facilitating observation of changes in the magnetic field and force.
- The Hall effect sensor provides quantitative data on the magnetic field strength and direction, essential for drawing accurate conclusions.
- A controlled environment ensures that the observed effects are due only to the electromagnet and not external influences.
By using the right-hand rule, Leisha can analyze the effects of the current's direction on the magnetic force exerted by the electromagnet. Understanding the underlying principles, such as Faraday's law of induction and Lenz's law, will be crucial in her analysis of how a changing magnetic field can induce a current and how this induced current generates a magnetic field opposing the change, as described in the underlying concepts of magnetic force and induction.