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The resistances of three parts of a cir...

The resistances of three parts of a circular loop are as shown in Fig. The magnetic field at the centre O is (current enters at A and leaves at B and C as shown)

A

`(mu_0I)/(6a)`

B

`(mu_0I)/(3a)`

C

`2/3 (mu_0I)/a`

D

zero.

Text Solution

Verified by Experts

The correct Answer is:
D
(d) No current will flow through will be as shown in option (b)
points B and C are same. Therefore magnetic field at center O
will be equal and opposite due to section AB and AC. Hence,
they cancel out.
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CENGAGE PHYSICS ENGLISH-SOURCES OF MAGNETIC FIELD-Exercise (single Correct )
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  2. A current i is unifromly distributed over the cross section of a lon...

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  3. The resistances of three parts of a circular loop are as shown in Fig...

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  4. Five very long, straight insulated wires are closely bound together to...

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  5. The magnetic induction at centre O Fig.

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  6. The magnetic field at centre O of the arc in Fig.

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  7. Three long, straight and parallel wires carrying currents are arranged...

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  8. Two long thin wires ABC and DEF are arranged as shown in the figure. T...

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  9. The magnetic field at O due to current in the infinite wire forming a ...

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  10. A current I flows through a thin wire shaped as regular polygon of n s...

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  11. A wire is bent in the form of a circular arc with a straight portion A...

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  12. The field due to a wire of n turns and radius r which carries a curren...

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  13. Two identical wires A and B , each of length 'l', carry the same curre...

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  14. Four infinite thin current carrying sheets are placed in Y-Z plane. Th...

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  15. A steady current is flowing in a circular coil of radius R, made up o...

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  16. What is the magnetic field at the centre of the circular ( as shown in...

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  17. Two parallel wires carrying equal currents in opposite direaction a...

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  18. Figure here shows three cases, in all cases the circular path has radi...

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  19. An otherwise infinite, straight wire has two concentric loops of radii...

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  20. Current I1 and I2 flow in the wires shown in Fig. The field is zero at...

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