Class 12 Physics Important Questions | Chapter 12 Electromagnetic Induction

Here we have a given Class 12 Physics Important Questions for Maharashtra Board HSC Examination 2023. Every students want to score good marks in Class 12 Board Exam,but number of students don't know how to score good marks. Dear students, given following questions had been asked in earlier HSC Board Examinations. From this post, you will know which type of questions had been asked in earlier Board Exams and same questions or same type of questions will be asked in your upcoming examination. If you study all these questions, you will get very good marks in your board examinations, Because so many questions from the following given questions will be asked in your upcoming examination.Therefore go through our Class 12 Physics Important Questions which are given in chapter-wise manner and simply try to solve these questions to score very good marks in Physics and obviously, you will! Best wishes to all dear students for your upcoming Maharashtra State Board Exam 2023.

यहां हमारे पास महाराष्ट्र बोर्ड HSC परीक्षा 2023 के लिए कक्षा 12वीं के Physics के महत्वपूर्ण प्रश्न दिए गए हैं। प्रत्येक छात्र कक्षा 12वीं की बोर्ड परीक्षा में अच्छे अंक प्राप्त करना चाहते हैं, लेकिन कई छात्र यह नहीं जानते कि अच्छे अंक कैसे प्राप्त करें। प्रिय छात्रों, नीचे दिए गए प्रश्न पिछले एचएससी बोर्ड परीक्षाओं में पूछे गए थे। इस पोस्ट से आप जानेंगे कि पिछली बोर्ड परीक्षाओं में किस प्रकार के प्रश्न पूछे गए थे और आपकी आगामी परीक्षा में भी इसी प्रकार के प्रश्न पूछे जाएंगे। यदि आप इन सभी प्रश्नों का अध्ययन करते हैं, तो आप अपनी बोर्ड परीक्षाओं में बहुत अच्छे अंक प्राप्त करेंगे, क्योंकि निम्नलिखित दिए गए प्रश्नों में से बहुत सारे प्रश्न आपकी आगामी परीक्षा में पूछे जाएंगे। इसलिए हमारे कक्षा 12 के भौतिकी के महत्वपूर्ण प्रश्नों को देखें जो अध्याय में दिए गए हैं | फिजिक्स में बहुत अच्छे अंक प्राप्त करने के लिए इन प्रश्नों को बुद्धिमान तरीके से हल करने का प्रयास करें और जाहिर है, आप करेंगे! सभी प्रिय छात्रों को आपकी आगामी महाराष्ट्र राज्य बोर्ड परीक्षा 2023 के लिए शुभकामनाएं।



Class 12 Physics Important Questions | Chapter 12 Electromagnetic Induction

• Obtain an expression for the e.m.f. induced in a coil rotating in uniform magnetic field. (March 2012)

• State Faraday's laws of electromagnetic induction. (March 2013)

• State Faraday's laws of electromagnetic induction and Lenz's law. Prove theoretically, the relation between e.m.f. induced and rate of change of magnetic flux in a coil moving in a uniform magnetic field. (March 2013)

• Obtain an expresion for the induced e.m.f. in coil rotating with uniform angular velocity in uniform magnetic field. Plot a graph of variation of induced e.m.f. against phase (Φ = wt ) over one cycle. (Oct 2013)

• State the principle of a transformer. Explain its construction and working. Derive an expression for the ratio of e.m.f.s in terms of number of turns in primary and secondary coil. (March 2014)

• A metal rod 1/√π m long rotates about one of its ends perpendicular to a plane whose magnetic induction is 4 x 10-3 T. Calculate the number of revolutions made by the rod per second if the e.m.f. induced between the ends of the rod is 16 mV. (March 2014)

• Explain the phenomenon of self induction and mutual induction. Define coefficient of self induction and mutual induction. Write the S.I.unit and dimensions of coefficient of self induction. (Oct 2014)


• Obtain an expression for e.m.f. induced in a coil rotating with uniform angular velocity in uniform magnetic field. Show graphically the variation of e.m.f. with time (t). (March 2015)

• The magnetic flux through a loop varies according to the relation Φ = 8t2 + 6t + = C, where C is constant, 'Φ' is in milliweber and t is in second. What is the magnitude of induced e.m.f. in the loop at t = 2 seconds? (March 2015)

• A coil of 100 turns, each of area 0.02 m2 is kept in a unifom field of induction 3.5 x 10-5 T. If the coil rotates with a speed of 6000 r.p.m. about an axis in the plane of the coil and perpendicular to the magnetic induction, calculate peak value of e.m.f. induced in the coil. (Oct 2015)

• State the principle on which transformer works. Explain its working with construction. Derive an expression for ratio of e.m.f.s and currents in terms of number of turns in primary and secondary coil. (March 2016)

• The co-efficient of mutual induction between primary and secondary coil is 2 H. Calculate induced e.m.f. if current of 4 A is cut off in 2.5 x 10-4 seconds.
(March 2016)

• What is electromagnetic induction? Prove theoretically e =  -dΦ/dt (July 2016)

• Explain self induction and mutual induction. (March 2017)

• The magnetic flux through a loop is varying according to a relation Φ = 6t2 + 7t + 1 where Φ is in milliweber and t is in second. What is the e.m.f. induced in the loop at t = 2 second? (March 2017)

• State the principle of working of transformer. Explain the construction and working of a transformer. Derive an expression for e.m.f. and current in terms of turns ratio. (July 2017)

• Prove theoretically the relation between e.m.f. induced in a coil and rate of change of magnetic flux in electromagnetic induction. (March 2018)

• At which position of the plane of the rotating coil with the direction of magnetic field, the e.m.f. induced in the coil is maximum? (March 2019)

• What does the negative sign indicate in Lenz's law? (March 2020)

• Distinguish between step-up and step-down transformer. (March 2020)


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