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Q.

Two like magnetic poles of strength 10 and 40 S.I units are separated by a distance 30cm. The intensity of magnetic field is zero on the line joining them

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a

At a point 10cm from the stronger pole

b

At a point 20 cm form the stronger pole

c

At the midpoint

d

At infinity

answer is B.

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Detailed Solution

μo4π10x2=μo4π4030−x2 ⇒10x2=4030−x2 ⇒1x=230−x ⇒30−x=2x ⇒x=10 cm ∴from stronger pole distance is 20 cm
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