The chapter "Moving Charges and Magnetism" is a cornerstone of Electromagnetism in the Class 12 Physics syllabus. It bridges the gap between static electricity and magnetism, explaining how moving charges generate magnetic fields and how these fields, in turn, exert forces on other moving charges and currents. For CBSE board exams, this chapter carries significant weightage, often featuring a mix of conceptual MCQs, derivation-based questions, and numerical problems related to the Biot-Savart Law and Ampere’s Circuital Law.
Mastering this chapter is essential for understanding advanced topics like Electromagnetic Induction and Alternating Currents. Students should focus on the vector nature of magnetic forces, the motion of charged particles in uniform magnetic fields, and the functional principles of the Moving Coil Galvanometer. This practice set is designed to test your proficiency in these areas, aligning strictly with the NCERT curriculum and the 2024-25 CBSE examination pattern.
30
Minutes
30
Questions
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Marking
Q1. A charged particle is moving through a uniform magnetic field. Which of the following quantities of the particle will NOT change?
Velocity
Momentum
Kinetic Energy
Acceleration
Q2. The magnetic field at the center of a circular current-carrying loop of radius is . What will be the magnetic field at the center if the radius is doubled and the current is halved?
Q3. According to the Biot-Savart law, the magnetic field due to a current element at a distance is proportional to:
Q4. A proton and an alpha particle enter a uniform magnetic field with the same velocity perpendicular to the field. The ratio of the radii of their circular paths is:
1 : 2
2 : 1
1 : 1
1 : 4
Q5. Two long parallel wires carrying currents in the same direction will:
Repel each other
Attract each other
Neither attract nor repel
Rotate each other
Q6. The S.I. unit of magnetic permeability is:
Q7. A solenoid of length m and radius cm has turns. If a current of A flows through it, the magnetic field inside the solenoid is:
T
T
T
T
Q8. A current-carrying loop placed in a uniform magnetic field experiences a maximum torque when the angle between the area vector and the magnetic field is:
Q9. The sensitivity of a moving coil galvanometer can be increased by:
Decreasing the number of turns
Decreasing the area of the coil
Increasing the magnetic field
Increasing the torsional constant of the spring
Q10. To convert a galvanometer of resistance into an ammeter of range , the required shunt resistance is:
Q11. An electron is moving north in a region where the magnetic field is directed vertically upward. The magnetic force on the electron is directed towards:
East
West
South
North
Q12. The magnetic field at a distance from a long straight wire carrying current varies as:
Q13. A current flows through a square loop of side . The magnetic field at the center of the loop is:
Q14. If the speed of a charged particle moving in a magnetic field is doubled, then the period of revolution:
Is doubled
Is halved
Remains the same
Becomes four times
Q15. The magnetic dipole moment of a current-carrying coil does NOT depend on:
Number of turns
Current
Area of the coil
Magnetic field in which it is kept
...and 15 more challenging questions available in the interactive simulator.