Question
What is the magnetic effect of an electric current? Explain with examples.
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Answer
When electric current flows through a conductor (like a wire), it produces a magnetic field around it. This phenomenon is known as the magnetic effect of electric current. The magnetic field disappears when the current stops flowing. The magnets formed by passing an electric current through conducting wires are called electromagnets. Examples of electromagnets used in our daily life are electric doorbells, magnets used in loudspeakers, electric motors, fans, and many toys. Electromagnets of very high strength are used in industry to lift heavy loads of iron scrap to feed these into furnaces or for sorting heavy scrap items.
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The synthetic fibre $A$ is chemically a polyamide whereas the synthetic fibre $B$ contains a large number of ester groups. Another synthetic fibre $C$ is made of a polymer $D$ which consists of a number of glucose units joined one after the other.
$a.$ Which fibre could be $(i)$ terylene $(ii)$ rayon, and $(iii)$ nylon?
$b.$ Name the polymer $D$.
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$d.$ Which fibre $(A, B$ or $C)$ contains the same type of groups as those in a $\text{PET}$ jar?
→$a.$ Which fibre could be $(i)$ terylene $(ii)$ rayon, and $(iii)$ nylon?
$b.$ Name the polymer $D$.
$c.$ Which fibre $(A, B$ or $C)$ is prepared from a natural raw material?
$d.$ Which fibre $(A, B$ or $C)$ contains the same type of groups as those in a $\text{PET}$ jar?
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