A small bar magnet is moved through a coil at constant speed from one end to the other. Which of the following series of observations will be seen on the galvanometer G attached across the coil?
A small bar magnet is moved through a coil at constant speed from one end to the other. Which of the following series of observations will be seen on the galvanometer G attached across the coil?
Option 1 -
a
Option 2 -
b
Option 3 -
c
Option 4 -
d
-
1 Answer
-
Correct Option - 1
Detailed Solution:(A) The magnet's entry
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Bv = B sin 60°
->
M = φ? /I? = (B? A? )/I? = [ (μ? I? /2R? )πR? ²]/I?
[Diagram of two concentric coils]
M = (μ? πR? ²)/ (2R? )
M ∝ R? ²/R?
R =
L = 2 mH
E = 9V
Just after the switch ‘S’ is closed, the inductor acts as open circuit.
PR = l2R
=> 640 = (8)2 R
R =
from (i) 64 =
L = 2H
At any time
e will be maximum when
is
.
e will be minimum when
is
So, answer will be (1).
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