Question

U wire.
12
[CBSE Marking Scheme, 2012]
U Q. 13. (a) Write the special name given to the coil AB
which has many circular turns of insulated
copper wire.
(b) List two factors on which the strength of the
magnetic field produced by AB depends.
(c) What is the effect of placing an iron core in the coil
AB ?
А
B.
mo
+
[Board Term I, Set-53, 2012]
o
+1​

Answer 1

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Answer 2

Answer:

a)SOLENOID is the name of that coil Ab.

b)

1. The strength of current in the solenoid: Larger the current passed through solenoid, stronger will be the magnetic field produced.

2. The number of turns in the solenoid: Larger the number of turns in the solenoid, greater will be the magnetic field produced.

c)By placing a core inside of a coil the strength of the magnetic field can be increased. By putting a ferrous (iron) core inside a solenoid, the field lines are concentrated. This has the effect of strengthening the field. Inside the core, the field lines are much closer together → stronger field.