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Two thick wires and two thin wires, all of the same materials and same length forma square in the three different ways P, Q and R as shown in fig with current connection shown, the magnetic field at the centre of the square is zero in cases

A

A only

B

A & B only

C

B & C only

D

A & C only

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A
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AAKASH INSTITUTE ENGLISH-MOVING CHARGE AND MAGNESIUM-EXERCISE
  1. Charge q is uniformly spread on thin ring of radius R. The ring rotate...

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  2. Two similar circular loops of radius R are lying concentrically with t...

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  3. A circular coil carrying a certain, current produces a magnetic field ...

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  4. The magnetic induction at the centre of a current carrying circular co...

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  5. Same current i is flowing in three infinitely long wires along positiv...

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  6. Magnetic field at point O due to the given structure is

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  7. Magnetic field at the centre O due to the given structure is

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  8. A solenoid 1.5 metre and 4.0 cm in diameter possesses 10 turns/cm. A c...

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  9. Two thick wires and two thin wires, all of the same materials and same...

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  10. Current I flows through solenoid of length L having N number of turns,...

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  11. A straight wire of mass 200 g and length 1.5 m carries a current of 2 ...

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  12. A conducting loop carrying a current l is placed in a uniform magnetic...

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  13. A circular coil of wire carries a current PQ is part of a very long wi...

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  14. A circular wire ABC and a straight conductor ADC are carrying current ...

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  15. A semicircular wire PQS of radius R is connected to a wire bent in the...

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  16. A small circular flexible loop of wire of radius r carries a current I...

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  17. Two circular coils mounted parallel to each other on the same axis car...

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  18. A long straight wire is carrying a current of 25 A. A squre loop of si...

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

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  20. To make the field radial in a moving coil galvanometer

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