Electromagnetism

Question 1

What creates an magnetic field?

Answer 1

an electric current in a conductor produces a magnetic field around it (the larger the current, the stronger the field),the direction of the magnetic field depends on the direction of the current

Question 2

Describe the construction of an electromagnet

Answer 2

wrap a coil of insulated wire around an iron core, connected to a battery and switch in a rectangular

Question 3

What is the magnetic field around a straight wire?

Answer 3

concentric circles with wire in circle going forward

Question 4

What is the magnetic field around a flat circular coil?

Answer 4

similar to bar magnet, concentric eclipses around coil

Question 5

What is the magnetic field around a solenoid?

Answer 5

strong, uniform, outside is just like bar magnet with current coiled round

Question 6

What is magnetically hard or soft?

Answer 6

a magnetic material can be magnetically soft or hard if it looses it induced magnetism quickly or keeps its permanently (iron is soft, steel is hard)