This chapter explains the relationship between electric current and magnetic fields. Students learn how a current-carrying conductor produces a magnetic field around it and how this field interacts with other conductors and charged particles.
It also includes important topics such as Ampere’s Law, magnetic flux, force on a current-carrying conductor, cathode rays, and galvanometer. These concepts help in understanding how magnetic effects of current are used in different electrical devices.
This chapter is very useful for board exams as it builds a strong understanding of basic electromagnetic principles and their real-life applications.
📥 Download Class 12 Physics Chapter 14 Electromagnetism Notes (Punjab Board)
Get complete and well-organized notes of Electromagnetism including all important topics, definitions, and exam-focused material.
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✔ Complete Chapter Notes
✔ Important Definitions & Concepts
✔ MCQs with Answers
✔ Short Questions (Exam Based)
✔ Long Questions
✔ Key Formulas & Laws
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📝 MCQs – Class 12 Physics Electromagnetism
1. A magnetic field is produced around:
(a) A stationary conductor
(b) A current-carrying conductor ✅
(c) A resistor
(d) A capacitor
2. Right hand rule is used to determine:
(a) Direction of current
(b) Magnitude of current
(c) Direction of magnetic field around a conductor ✅
(d) Resistance of conductor
3. A Cathode Ray Oscilloscope (CRO) is used for:
(a) Measuring resistance
(b) Measuring current
(c) Displaying waveform of voltage ✅
(d) Measuring capacitance
4. A galvanometer is converted into a voltmeter by:
(a) Connecting low resistance in parallel
(b) Connecting high resistance in series ✅
(c) Connecting battery
(d) Using shunt resistor
5. The direction of magnetic field around a current-carrying wire depends on:
(a) Thickness of wire
(b) Length of wire
(c) Direction of current ✅
(d) Resistance of wire
6. The rule used to find the direction of magnetic field around a straight wire is:
(a) Left-hand rule
(b) Fleming’s rule
(c) Right-hand rule ✅
(d) Ampere’s rule
7. A current flowing away from the reader is represented by:
(a) Cross (×) ✅
(b) Dot (•)
(c) Arrow
(d) Minus (-)
8. AVO meter can measure:
(a) Current
(b) Voltage
(c) Resistance
(d) All of the above ✅
❓FAQs – Electromagnetism
Q1: What is a magnetic field?
A magnetic field is the region around a current-carrying conductor or magnet where magnetic force can be experienced.
Q2: Which rule is used to find the direction of magnetic field around a wire?
The right-hand rule is used to determine the direction of the magnetic field around a current-carrying wire.
Q3: What does a CRO measure?
A Cathode Ray Oscilloscope (CRO) is used to display the waveform of electrical signals (voltage vs time).
Q4: How is a galvanometer converted into a voltmeter?
A galvanometer is converted into a voltmeter by connecting a high resistance in series.
Q5: What does a galvanometer measure?
A galvanometer is used to detect and measure small electric currents.
Q6: What is the SI unit of magnetic flux?
The SI unit of magnetic flux is Weber (Wb).
Q7: What is the difference between dot and cross in current direction?
A dot (•) represents current coming out of the page, while a cross (×) represents current going into the page.