magnetism

Question 1

what are induced magnets

Answer 1

magnets that can be switched on and off and are only in current carrying conductors

Question 2

what are 4 magnetic metals

Answer 2

iron cobalt nickle steel

Question 3

what are permanent magnets

Answer 3

magnets that cannot be switched off and produce their own magnetic field

Question 4

what is a solenoid

Answer 4

a coil of wire composed of loops

Question 5

what direction does magnetic field go in

Answer 5

north to south

Question 6

opposite poles ____ and same poles ____

Answer 6

attract,repell

Question 7

can poles be seperated

Answer 7

no

Question 8

whats a uniform magnetic field

Answer 8

-parallel lines between two magnets that have an equal strength of magnetic field

Question 9

what does it mean when field lines are closer together

Answer 9

that the magnetic field in stronger

Question 10

why is earth is a giant magnet

Answer 10

because its core contains iron cobalt and nickle

Question 11

what are the 3 ways a strength of electromagnet can be increased

Answer 11

-increasing number of coils
-adding an iron core
-increasing the current

Question 12

what type of wires is used in practicals

Answer 12

insulating wires (coated with insluator)

Question 13

how do we test the strength of elecromagnets

Answer 13

by using steel paperclips

Question 15

Describe how the student can investigate how the magnitude of current effects the strength of an electromagnets

Answer 15

Method of varying the current.
• Use ammeter to measure the current.
• Determine the maximum number of paper clips the electromagnet can hold. • Repeat for other values of current.
• Switch off and remove paperclips between readings.
• Use the same number of turns.
• Use the same iron core.
• Plot a graph of number of paper clips against current.