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Give the direction of current passing th...

Give the direction of current passing through an open surface.

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If the fingers of the right hand be curled in the sense the boundary is traversed in the loop intergral, then the direction of the thumb gives the sense in which the current is regarded as positive.
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SUBHASH PUBLICATION-MOVING CHARGES AND MAGNETISM-TWO MARKS QUESTIONS WITH ANSWERS
  1. What is meant by 'magnetic dipole moment' of current loop? Write its S...

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  2. Compare the ratio of magnetic field produced at the centre of a circul...

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  3. Explain the mechanical effect produced by an electric current.

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  4. Give any two differences between an ammeter and a voltmeter.

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  5. What is the nature of force between two parallel wires carrying curren...

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  6. Why should the effective resistance of an ideal ammeter be zero and th...

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  7. Write the expression for the torque on a current loop placed in a unif...

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  9. Give the expression for Lorentz force acting on a moving electric char...

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  10. An electron in an electric field is made static and prevented from fal...

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  11. What is the cause for the helical motion of a charged particle in a ma...

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  12. What is meant by the pitch of a charged particle describe a helical pa...

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  13. Give the direction of current passing through an open surface.

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  14. State Ampere's circuital law and represent it mathematically.

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  15. Write the equation for the force between the two parallel straight wir...

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  16. Give the direction of the magnetic field due to a current carrying cir...

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  17. Can a current carrying circular loop act as a magnetic dipole? Give th...

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  18. Give an analogy for the torques experienced by an electric dipole and ...

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  19. Write the expression for the magnetic moment due to an electron circul...

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  20. Represent the magnetic moment vector in terms of angular momentum vect...

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