Question

Q3. Write T for true and F for false statements.
a. Electromagnet is used in electric fan
b. When current flows through the conductor magnetic field is produce
e. Coil of heating devices are made up of good conductor.
d. Electromagnet is used in electric heater.
e. Fuse works on the principle of heating effect of electricity.
f. Bulb filament has very high resistance.
g. Copper is a semiconductor
h. Earth wire has green insulation
04 Write difference between electromagnet and permanent mag​

Answer 1

Explanation:

a) true

b) true

c) true

d)false

e)true

f)true

g)true

h)false

Answer 2

Answer:

Q3.

a.T

b.T

c.F

d.F

e.T

f.T

g.T

h.T

Q4. A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field.  As the name suggests, a permanent magnet is 'permanent'. This means that it always has a magnetic field and will display a magnetic behavior at all times.

An electromagnet is made from a coil of wire which acts as a magnet when an electric current passes through it. Often an electromagnet is wrapped around a core of ferromagnetic material like steel, which enhances the magnetic field produced by the coil.

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