Moving Charges and Magnetism TEST 1

 

Moving Charges and Magnetism

Section A: Multiple Choice Questions

1. The magnetic field lines around a straight current-carrying conductor are: a) Concentric circles centered on the conductor b) Straight lines parallel to the conductor c) Hyperbolic curves around the conductor d) Elliptical curves around the conductor

2. The magnetic field inside a solenoid is: a) Uniform and parallel to the axis of the solenoid b) Non-uniform and perpendicular to the axis of the solenoid c) Non-uniform and parallel to the axis of the solenoid d) Uniform and perpendicular to the axis of the solenoid

3. The force experienced by a current-carrying conductor in a magnetic field is maximum when: a) The conductor is perpendicular to the magnetic field b) The conductor is parallel to the magnetic field c) The conductor makes an angle of 45 degrees with the magnetic field d) The force is independent of the angle between the conductor and the magnetic field

4. The magnetic field lines around a bar magnet: a) Always start from the north pole and end at the south pole b) Always start from the south pole and end at the north pole c) Form closed loops from north to south pole outside the magnet and south to north pole inside the magnet d) Do not form closed loops and extend indefinitely

5. The phenomenon of electromagnetic induction is based on: a) The flow of current through a conductor b) The presence of a magnetic field c) The movement of charges in a magnetic field d) The change in magnetic field intensity

Section B: Short Answer Questions

1. State Ampere's circuital law.

2. Explain the working principle of an AC generator.

3. State Lenz's law and its application in electromagnetic induction.

4. Define the term 'magnetic dipole' and explain its behavior in a magnetic field.

5. State the applications of the Hall effect.

Section C: Long Answer Questions

1. Two long parallel wires, each carrying a current of 5 A, are separated by a distance of 10 cm. Calculate the force per unit length between the wires.

2. A rectangular loop carrying a current of 3 A is placed in a magnetic field of 0.2 T. If the dimensions of the loop are 4 cm by 6 cm, calculate the magnetic force on the loop.

3. Describe the construction and working principle of a cyclotron.

4. A wire of length 3 m is bent to form a circular loop. If a current of 4 A flows through the loop, calculate the magnetic field at its center.

5. Explain the concept of mutual induction and provide an example.