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JEE Main 18 March 2021 Shift 1 Solved Paper
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© examsnet.com
Question : 6
Total: 90
Four identical long solenoids
A
,
B
,
C
and
D
are connected to each other as shown in the figure. If the magnetic field at the centre of
A
is
3
T
, the field at the centre of
C
would be (Assume that, the magnetic field is confined with in the volume of respective solenoid)
[18 Mar 2021 Shift 1]
12T
6T
9T
1T
Validate
Solution:
Given, magnetic field at the centre at
A
is
3
T
.
Since, the solenoid
B
,
C
and
D
are connected in parallel arrangement.
We know that,
The magnetic field in the circuit is directly proportional to the
B
∝
i
⇒
B
A
B
C
=
I
A
I
C
⇒
3
T
B
C
=
i
i
∕
3
⇒
B
C
=
1
T
So, the field at the centre at
C
=
1
T
.
© examsnet.com
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