Question 6
Commercial electric motors do not use

(a) an electromagnet to rotate the armature
(b) effectively large number of turns of conducting wire in the current carrying coil
(c) a permanent magnet to rotate the armature
(d) a soft iron core on which the coil is wound

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Solution

Option (c) is correct.
The commercial motors use:
(i) An electromagnet in place of permanent magnet
(ii) Large number of turns of the conducting wire in the current carrying coil
(iii) A soft iron core on which the coil is wound.

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Question 6
Commercial electric motors do not use

(a) an electromagnet to rotate the armature
(b) effectively large number of turns of conducting wire in the current carrying coil
(c) a permanent magnet to rotate the armature
(d) a soft iron core on which the coil is wound

Commercial electric motors do not use a permanent magnet to rotate the armature.

Q. Each one of the following changes will increase emf (or voltage) in a simple generator except:

(a) increasing the number of turns in the armature coil
(b) winding the coil on a soft iron armature
(c) increasing the size of the gap in which the armature turns
(d) increasing the speed of rotation

Each one of the following changes will increase emf (or voltage) in a simple generator except :

(a) increasing the number of turns in the armature coil

(b) winding the coil on a soft iron armature

(d) increasing the speed of rotation

If the number of turns in the armature coil is doubled, the speed of rotation of the armature coil ___.

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Question 6 Commercial electric motors do not use (a) an electromagnet to rotate the armature (b) effectively large number of turns of conducting wire in the current carrying coil (c) a permanent magnet to rotate the armature (d) a soft iron core on which the coil is wound​​​​​​​

Option (c) is correct. The commercial motors use: (i) An electromagnet in place of permanent magnet (ii) Large number of turns of the conducting wire in the current carrying coil (iii) A soft iron core on which the coil is wound.

Question 6
Commercial electric motors do not use

(a) an electromagnet to rotate the armature
(b) effectively large number of turns of conducting wire in the current carrying coil
(c) a permanent magnet to rotate the armature
(d) a soft iron core on which the coil is wound

Option (c) is correct.
The commercial motors use:
(i) An electromagnet in place of permanent magnet
(ii) Large number of turns of the conducting wire in the current carrying coil
(iii) A soft iron core on which the coil is wound.