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# Tutor profile: Nayyar M.

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Nayyar M.
Expert in Physics, Maths, and Electrical Engineering subjetcs
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## Questions

### Subject:Electrical Engineering

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Question:

What is the difference between a generator and alternator?

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Nayyar M.

The major difference between the alternator and the generator is that in alternator the armature is stationary and the field system rotates whereas in the generator armature rotates and field is stationary. The armature of the alternator is mounted on the stationary element called stator and field winding on a rotating element. While the connection of a generator is just the reverse of it.

### Subject:Calculus

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Question:

Function f defined by f(x) = | x | has no critical points. (True or False) ?

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Nayyar M.

False. The derivative f '(x) is given by f '(x) = x / | x | f '(x) is undefined at x = 0 and therefore x = 0 is a critical point of function f given above. (see question 1 above).

### Subject:Physics

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Question:

What is the difference between permeability and permittivity?

Inactive
Nayyar M.

Permittivity is the capacity of a material to resist the formation of an electric field. On the other hand, permeability is the capacity of a material to allow the formation of a magnetic field.

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