Question

20. Electromagnetic induction can be generated m two ways, namely when the electric conductor is kept in a moving magnetic field and when the electric conductor is constantly moving within a static magnetic field. The phenomenon of electromagnetic induction was first discovered by Michael
Faraday when he moved a bar magnet through an electric coll. He noticed a change in voltage of the
circuit. The factors that could influence the electromagnetic induction are the number of coils, the
strength of the magnet, the changing magnetic fields and the speed of relative motion between coil and magnet.
a) What is electromagnetic induction?

i. The process of charging a body
ii. The process of rotating a coil of an electric motor
iii. Producing induced current in a coil due to relative motion between a magnet and the
iv.
The process of generating magnetic field due to a current passing through a coil.

b) A magnet is moved towards a coll (A) quickly and (B) slowly. The induced potential difference
will be
i. More in case (A) than in (B)
ii. Same in both cases
iii. More in case (B) than in (A)
adv.
iv. Cannot be decided

c) Which law determines the direction of induced current in a coil?
i. Fleming's right hand rule
ii. Right hand grip rule
iii. Fleming's left hand role
iv. Ampere's swimming rule

d) A device based on electromagnetic induction is
i. Voltmeter
ii. Electric motor
iii. Ammeter
iv. Electric generator

e) A rectangular copper coll of copper wire is rotating in a magnetic fieid. After how many
rotations will the direction of induced current change in this coil?
i. Two
ii. Half
iii. One
iv. Quarter​

Answer 1

Answer:

$\huge\mathbb\green{Answer⇛}$

$a) What \: is \: electromagnetic \: induction?$

$☞ \: iii. Producing \: induced \: current \: in \: a \: coil \\ due \: to \: relative \: motion \: between a \: magnet \\ and \: the \: coil.$

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$b) A \: magnet \: is \: moved \: towards \: a \: coll \\ (A) \: quickly \: and \: (B) \: slowly. The \: \\ induced \: potential \: difference \: will \: be$

$☞ii. Same \: in \: both \: cases.$

__________________________________

$c) Which \: law \: determines \: the \: direction \\ of \: induced \: current \: in \: a \: coil?$

$☞i. Fleming's \: right \: hand \: rule$

__________________________________

$d) \: A \: device \: based \: on \: electromagnetic \\ induction \: is -$

$☞iv. Electric \: generator$

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$e)A \: rectangular \: copper \: coll \: of \: copper \\ wire \: is \: rotating \: in \: a \: magnetic \: fieid. \: After \\ how \: many \: rotations \: will \: the \: direction \\ of \: induced \: current \: change \: in \: this \: coil?$

$☞ii. Half$

Answer 2

Answer:

iii

ii

iv

i

Explanation:

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