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Question
Physics
The coercivity of a small magnet where the ferromagnet gets demagnetised is 3× 103 A m-1 . The current required to be passed in a solenoid of length 10 cm and number of turns 100, so that the magnet gets demagnetised when inside the solenoid, is
Q. The coercivity of a small magnet where the ferromagnet gets demagnetised is
3
×
10
3
A
m
−
1
. The current required to be passed in a solenoid of length
10
c
m
and number of turns
100
, so that the magnet gets demagnetised when inside the solenoid, is
6285
191
JEE Main
JEE Main 2014
Moving Charges and Magnetism
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A
30 mA
8%
B
60 mA
17%
C
3 A
61%
D
6A
13%
Solution:
B
=
μ
0
n
i
μ
0
B
=
ni
3
×
1
0
3
=
L
N
I
=
10
×
1
0
−
2
100
×
i
I
=
3
A