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Q.

A condenser is charged using a constant current. The ratio of the magnetic fields at a distance of R3  &R4  from the axis is (R is the Radius of plate)

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a

1:1

b

4:3

c

1:2

d

2:3

answer is B.

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Detailed Solution

B=μ0ir2πR2  Here B is strength of magnetic filed    ‘r’ is the distance of point from the conducting wire  ⇒B1B2=r1r2=R3R4=43
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