PHYSICS - MAGNETIC EFFECT OF CURRENT - CLASS 12 - ASSIGNMENT 4

 

PHYSICS

MAGNETIC EFFECT OF CURRENT

CLASS 12

ASSIGNMENT 4


1. Explain the concept of magnetic field. 


2. Describe Oersted's experiment leading the to the discovery of magnetic effect of current. 


3. State Ampere's swimming rule. 


4. State Biot-Savart law.


5. Explain Biot-Savart law for the magnetic field produced by a current element. Derive its vector form. How will you find the direction of the magnetic field?


6. Write any two points of similarities between Coulomb's law for the electrostatic field and Biot-Savart's law for the magnetic field.


7. Write any two points of differences between Coulomb's law for the electrostatic field and Biot=Savart's law for the magnetic field.


8. What is the SI unit of magnetic field?


9. Write a relation between μ₀ , 𝜺₀ and c.


10. Apply Biot-Savart law to derive an expression for the magnetic field produced at a point due to the current flowing through a straight wire of infinite length.  


11. State the rules for finding the direction of the magnetic field.


12. Show the magnetic lines of force around a straight current carrying conductor.


13. What is the nature of the magnetic field associated with the current in a straight conductor?


14. Apply Biot-Savart law to derive an expression for the magnetic field at the centre of a current carrying circular loop.


15. Apply Biot-Savart law to find the magnetic field due to a circular current carrying loop at a point on the axis of the loop.  


16. State the rules for finding the magnetic field due to a circular current loop.


17. State Ampere's circuital law and prove it for the magnetic field produced by a straight current carrying conductor. 


18. Using Ampere's circuital theorem, calculate the magnetic field due to an infinitely long wire carrying a current I.


19. How does a current carrying coil behave like a bar magnet?


20. Where is the magnetic field of a current element (i) minimum and (ii) maximum?


21. How much is the flux density B at the centre of a long solenoid?


22. Draw the magnetic field lines due to a current carrying loop.


23. What is a toroid?


24. Is the source of magnetic field an analogue to the source of electric field?


25. How can it be shown that an electric current in a wire produces a magnetic field around it?


26. A circular coil of wire consisting of 100 turns each of radius 8 cm carries a current of 0.40 A.  What is the magnitude of the magnetic field B at the centre of the coil?


27. A long straight wire carries a current of 35 A.  What is the magnitude of the field B at a point 20 cm from the wire?


28. A long straight wire in the horizontal plane carries a current of 50 A in the north to south direction.  Give the magnitude and direction of B at a point 2.5 m east of the wire.


29. A closely wound solenoid 80 cm long has 5 layers of windings of 400 turns each.  The diameter of the solenoid is 1.8 cm.  If the current carried is 8 A, estimate the magnitude of B inside the solenoid near its centre.


30. A horizontal overhead power line carries a current of 90 A in an east to west direction.  What is the magnitude and direction of magnetic field due to the current 1.5 m below the line?


31. Why does a solenoid contract when a current is passed through it?


32. Draw the graph between the magnetic field B and the distance a from the straight current carrying conductor .

                                         OR

Show the variation of magnetic field with distance from straight current carrying conductor.


33. State the rules for finding the direction of magnetic field due to straight current carrying conductor.


34.  How can the polarity of any end of the solenoid can be determined?


35. State the factors on which the force acting on a charge moving in a magnetic field depends.  Write the expression for this force. 


36. What is the force experienced by a stationary charge?


37. When does a charged particle experience the maximum force?


38. What is the work done by a magnetic field on a moving charge?


39. What is Lorentz force? Write an expression for it.


40. What is velocity selector or filter?


41.  Under what circumstances will a current carrying loop not rotate in the magnetic field?


42. What is a moving coil galvanometer? glimpses 26


43. Define (i) sensitivity of a galvanometer

(ii) current sensitivity

(iii) voltage sensitivity

(iv) galvanometer constant


44. State the factors on which sensitivity of a MCG depend.


45. State the factors by which the sensitivity of a MCG can be increased.


46. State any 3 advantages of MCG.


47. State any 2 disadvantages of MCG.


48. How can a MCG be converted into an ammeter?


49. How can a MCG be converted into a voltmeter?


50. What is a shunt? Mention its uses.





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