Electricity from Magnetism
Electricity from magnetism is a fundamental principle in physics, elucidating the intricate relationship between magnetic fields and electric currents. This phenomenon, known as electromagnetism, underpins various technologies, from generators to transformers, driving the modern world's power systems. Michael Faraday's groundbreaking experiments in the 19th century laid the foundation for understanding this phenomenon, demonstrating how a changing magnetic field induces an electric current. Today, this principle is harnessed in numerous applications, including power generation, electric motors, and magnetic levitation systems, shaping the landscape of modern technology and industry.
Questions
- How can electromagnetic induction be increased?
- How does electromagnetic induction work in a large audio speaker?
- In nuclear physics, what is meant by the term 'mass defect', and what is its relation to nuclear energy?
- At the equator a 1000 turn coil with a cross sectional area of 300 cm2 and a resistance of 15 #Omega# is aligned with its plane perpendicular to the earth’s magnetic field of 7*10^-5 T . If the coil is flipped over how much charge flows through it?
- How many turns of wire must a coil have in order to induce a voltage of 10.5 volts when exposed to a changing magnetic flux with a rate of 0.0075 Wb/s?
- What are some examples of electromagnetic induction?
- If a copper ring is brought closer to the end of a permanent magnet, a repulsive force will develop between the magnet and the ring. The force will cease when the ring stops moving. What is this effect called?
- Why would steel be bad to use as the core of an electromagnet?
- How can I construct an electromagnetic brake, whereby the energization of an electromagnet coil would produce mechanical "drag" on a rotating shaft without the need for contact between the shaft and a brake pad?
- How does electromagnetic induction produce electricity?
- What is electromagnetic induction in a conductor?
- What is electromagnetic induction in physics?
- How do you determine the height for Part B of this question?
- How are transmission lines protected from lightning strikes?
- What does the right-hand rule mean?
- How is electricity produced?
- What will happen if a copper loop wire is dropped over a magnet?
- Can anyone explain Lenz's law with an example?
- The magnetic flux through a coil containing 50 loops changes from 30 Wb to –30 Wb in 0.42 seconds. What is the voltage induced in the coil?
- A delta-wye transformer has a turns ratio of 9:1. The primary line voltage is 3600 V. What is the secondary line voltage?