Chapter – Magnetic effects of electric current

Q1. A) what is the nature of the magnetic field inside a solenoid?

b) What is the nature of the magnetic field due to a circular coil?

Q2. How does the magnetic field (B) due to a straight conductor vary with distance (r) from it?

Q3. How does the magnetic field(B) vary inside a solenoid?

Q4. How are magnetic field lines related to the strength of a magnetic field?

Q5. What is the relation between magnetic field(B), current (I) and distance (r) in case of a straight current carrying conductor?

Q6. What is meant by the term magnetic field lines? List two properties of magnetic field lines?

Q7. Write the rule which determines the direction of magnetic field developed around a straight conductor when current is passed through the conductor?

Q8. What kind of energy transformation takes place in an electric motor? Name any two devices which use an electric motor as an essential component?

Q9. On what factors the strength of magnetic field produced by current carrying solenoid depends?

Q10. Why does a current carrying conductor kept in a magnetic field experience a force? On what factors does the direction of this force depend? Name and state the rule used for determination of direction of this force?

Q11. How does the strength of the magnetic field at the centre of a circular coil of wire depend on:

i)                    The radius of the coil

ii)                   The number of turns of wire in the coil

iii)                 The strength of the current flowing in the coil.

Q12. How does a solenoid behave like a magnet? Can you determine the north and south poles of a current carrying solenoid with a help of bar magnet? Explain

Q13. When is the force experienced by a current carrying conductor placed in a magnetic field is largest?

Q14. Explain the principle of electric motor and electric generators (AC and DC). What is the function of a split ring in an electric motor?

Q15. A coil is insulated copper wire is connected to a galvanometer. What would happen if a bar magnet is

i)                    Pushed into the coil

ii)                   Withdrawn from inside the coil

iii)                 Held stationary inside the coil

Q16. State the rule to determine the direction of a

i)                    Magnetic field produced around a straight conductor carrying current

ii)                   Force experienced by a current carrying straight conductor placed in a magnetic field which is perpendicular to it.

iii)                 Current induced in a coil due to its rotation in a magnetic field

Q17. When does an electric short circuit occur?

Q18. What is the function of an earth wire? Why is it necessary to earth metallic appliances?

Q19. What does the direction of thumb indicate in the right hand rule? In what way this rule is different from Fleming’s left hand rule?

Q20. What is the role of the two conducting stationary brushes in a simple electric motor?

Q21. What is the role of fuse used in series with any electrical appliance? Why should a fuse with defined rating not be replaced by one with a larger rating?

Q22. List factors on which the value of induced current produced in a circuit depends.

Q23. Name and state the rule used to determine the direction of induced current.