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Explain the construction , principle and...

Explain the construction , principle and working of a D.C. motor. Find the expression for its efficiency.

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MODERN PUBLICATION-FORCE ON A CURRENT-EXERCISE
  1. How can a galvanometer be converted into an ammeter?

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  2. Explain how a Galvanometer can be converted into Voltmeter.

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  3. Explain the construction , principle and working of a D.C. motor. Find...

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  4. Draw a neat diagram of a d.c. motor and explain its working, what is t...

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  5. Draw a labelled diagram of a d.c. motor. State its principle and expla...

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  6. A straight conductor carries a current of 1.5 A and is 2 m long, is pl...

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  7. A straight conductor carries a current of 1.5 A and is 2 m long. is pl...

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  8. A straight conductor carries a current of 1.5 A and is 2 m long. Find ...

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  9. What is the magnitude of magnetic force per unit length on a wire carr...

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  10. What is the force on a wire of length 4.0 cm placed inside a solenoid ...

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  11. A current of 10 A flows through each of two parallel long wires. The w...

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  12. Calculate the force per unit length between two parallel long straight...

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  13. A currentof 5.0 A is flowing in eah of the two parallel conductors of ...

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  14. A current of 5.0 A flows through each of two parallel long wires. The ...

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  15. Two long straight conducors are placed parallel at a distance of 2 cm ...

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  16. Two straight wires A and B of lenghts 10 m and 12 m carrying currents ...

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  17. A wire AB is carrying a steady current of 12A and is lying on the tabl...

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  18. What torque acts ona 40 turn coil of 100 cm^2 area carrying a current ...

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  19. A square coil of side 10 cm consists of 20 turns and carries a current...

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  20. Calculate the torque on a 50 turn circular coil of radius 10 cm, when ...

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