Presence of magnetic field around an electric wire can be proved by which an behavior of iron filings

Presence of magnetic field around an electric wire can be proved by which an behavior of iron filings

(i) They form a circular pattern as soon as the electricity is turned on.

(ii) Try filing fly off the card when the current is on

(iii) They do not prove anything, because it is magic trick.

(iv) None of the above.

Ans: – Option (i).

 

Among this which property is not belong to electromagnet?

(i) It is permanent magnet

(ii) Its magnetic strength can not be decreased or increased at as well

(iii) Its polarity can be remove by reversing flow of electric current.

(iv) It produces strong magnetic field.

Ans: – Option(ii).

 

To find out the direction of force in the electric motor which rules is used?

(i) Flemings right hand rule

(ii) Flemings left hand rule

(iii) Right palm rule of right hand

(iv) Left palm rule of left hand.

Ans: – Option (ii).

 

Why does an iron core increase the magnetic field of a coil of wire –

(i) The iron atom line up to add the magnetic field

(ii) Iron attract things includes magnetic fields

(iii) The iron core actually decreases the field, allowing it to be turned off.

Ans: – Option (i).

 

List the factors affecting the strength of an electromagnet?

Ans: – The different factors that affect the strength of an electromagnet is –

    • Distance between the Poles.
    • Current in coil.
    • Number of turns in the coil.

What is the role of solenoids in making electromagnet?

Ans: – The purpose of solenoid is to produce the magnetism in this the there are present a solid iron core in this solenoid which produces the magnetic fields.

 

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