## Magnetic Effect of Current

(Theoretical Questions)

1. State Biot- Savart law and apply it to find the magnetic field due to a circular loop carrying current at a point (a) at its centre (b) on the axis

2. State Ampere's circuital law and apply it to find the magnetic field (a) inside a current carrying solenoid (b) inside a current carrying toroid.

3. Apply Ampere's circuital law to determine the magnetic field at a point due to a long straight current carrying conductor.

4. Derive an expression for the force on a current carrying conductor in a uniform magnetic field

5. Derive an expression for the force between long straight conductors carrying current and hence define 1 ampere.

6. Derive an expression for the torque on a current carrying loop in a uniform magnetic field.

7. Describe the principle construction and working of a Moving coil galvanometer.

8. Describe the conversion of a moving coil galvanometer into
(a) Ammeter
(b) Voltmeter

9. What is radial magnetic field? What is its importance in a moving coil galvanometer? How is a radial magnetic field realized in moving coil galvanometers?

10. Describe the principle construction and working of a cyclotron. Explain why an electron cannot be accelerated using a cyclotron.

11. Describe the motion of a charged particle in a magnetic field when it enters the field
(a) perpendicular to the field lines
(b) obliquely making and angle Θ with the field lines

12. Derive an expression for the magnetic dipole moment of a revolving electron and hence define Bohr magneton.  