विद्युत धारा — बार-बार पूछे जाने वाले प्रश्न
Last updated: 5 July 2026
Every RBSE Class 12 Physics board paper from 2013 to 2026 for Current Electricity, sorted and tagged so you know exactly which Kirchhoff's-law, Wheatstone-bridge and cell-combination questions to revise first.
Real previous-year questions with the exact RBSE board years they appeared in. 5 more high-yield questions — including more Kirchhoff's-law and cell-combination problems — are in the free PDF.
Draw the circuit diagram of a Wheatstone bridge and, using Kirchhoff's rules, derive the condition for zero (null) deflection of the galvanometer.
क्वीट-स्टोन सेतु का परिपथ चित्र बनाकर गैल्वेनोमीटर के शून्य विक्षेप के लिए किरखौफ के नियम से संतुलन प्रतिबन्ध प्राप्त कीजिए।
🔥 Most repeated · asked 5×Two cells of emf E₁ and E₂ having internal resistances r₁ and r₂ are connected in series. Derive expressions for the equivalent emf and the equivalent internal resistance of the combination.
दो सेलों के विद्युत वाहक बल E1 व E2 तथा आन्तरिक प्रतिरोध क्रमशः r1 व r2 हैं। इन्हें श्रेणीक्रम में जोड़ने पर तुल्य वि० वा० बल तथा तुल्य आन्तरिक प्रतिरोध का मान प्राप्त कीजिए।
🔁 Repeated · asked 3×The magnitude of the drift velocity per unit electric field is equal to ______ (mobility).
प्रति एकांक विद्युत क्षेत्र के अपवाह वेग का परिमाण _______ के बराबर होता है।
🔁 Repeated · asked 2×State Kirchhoff's second law (loop rule / voltage law) for electrical circuits.
किरखॉफ का द्वितीय नियम लिखिए।
⚙️ Core circuit lawState Kirchhoff's first rule. A 10 V battery of negligible internal resistance is connected across the diagonally opposite corners of a cubical network of 12 resistors, each of 2 Ω. Determine the equivalent resistance of the network.
किरचॉफ का संधि नियम बताइये। 10V तथा नगण्य आन्तरिक प्रतिरोध की बैटरी एक घनीय परिपथ जाल के विकर्णतः सम्मुख कोनों से जुड़ी है। परिपथ जाल में 2Ω प्रतिरोध के 12 प्रतिरोधक हैं। परिपथ जाल का समतुल्य प्रतिरोध ज्ञात कीजिए।
⭐ High-weightage numericalThe other 5 are in the free PDF — and all 28 previous-year questions for this chapter are in the full book.
Get 10 hand-picked previous-year questions from Chapter 3. Every question includes the exam year, marks, and repeat count. Instant download—no signup required.
A quick map of the chapter before you download — so you know what the questions are testing.
If you have gone through the last decade of RBSE Class 12 Physics papers, you will notice Chapter 3 is one of the most predictable — and one of the most rewarding — chapters to prepare. It belongs to Unit II – Current Electricity and reliably contributes around 6–8 marks to the paper every year, so it is never a chapter you can afford to skip. The topics rotate, but the question patterns stay remarkably steady.
Expect the 0.5 to 1-mark openers to test definitions and units — drift velocity and mobility, resistivity and its temperature dependence, current density, and the emf/internal resistance of a cell. The 1.5 to 2-mark questions lean on Ohm's law, Kirchhoff's junction and loop rules, and short numericals on terminal voltage. The heavy marks sit in the 3-mark long answers, which almost always ask you to derive the balance condition of the Wheatstone bridge (asked in 2013, 2018, 2021, 2023 and 2025) or to find the equivalent emf and internal resistance of cells combined in series.
So the smart way to revise this chapter is not to read it end to end, but to practise the questions RBSE actually repeats. The five questions above — and the ten in the free sample PDF — are taken straight from real board papers and tagged with the exact years they appeared, so you can see for yourself what the full RBSE Physics chapterwise PYQ book offers before you decide to buy it.
The RBSE syllabus sub-topics this chapter's PYQs are drawn from — useful for scoping your revision even if you're not buying the full book.
"Chapter 3 mein Wheatstone bridge wala derivation har saal aa jaata hai — is list se pata chal gaya kaunse questions pehle karne hain."
"Free PDF mein hi 10 solid questions mil gaye, wo bhi bina kisi login jhanjhat ke. Kirchhoff aur cell combination wale questions bahut kaam aaye."
"Year-wise tags dekh kar revision plan banana easy ho gaya. Poora 14-chapter book bhi le liya sirf ₹59 mein, paisa vasool."
The ₹59 full book unlocks all 28 tagged previous-year questions for Current Electricity — plus all 13 other chapters.
Every MCQ, VSA, SA and long-answer question for this chapter from RBSE papers 2013–2026 — 28 in total.
Each question labelled with year, marks and question type.
Highest-repeated questions listed first so revision time is spent well.
Full bilingual coverage — study in whichever medium you write your exam.
Quick-reference sheet of every current-electricity formula — Ohm's law, resistivity, Kirchhoff's rules and the Wheatstone bridge.
Updated to the latest RBSE board pattern, with access valid for the current 2026–27 exam session.
One booklet, every chapter, tagged and sorted by repeat priority — in English and Hindi.
See full book — ₹59 →