Home / Topic / Magnetic force
Topic Magnetic force
Asked 2 times across 2 UPSC exams over 5 years (2020–2025), peaking in 2020.
Key insights
- Most tested in NDA — 1 of 2 PYQs
- Most asked in 2020
- Recurs across 2 years (2020–2025)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
NDA 2020 → GEO 2025
How the concept evolved
Rising — more than half its appearances (2 of 2) are since 2016.
Related concepts
Ideas UPSC tests alongside this one — keep exploring.
Sample questions
You've seen the pattern — here are a few of the actual PYQs.
GEO2025
A 10 keV electron (mass = 9·1×10⁻³¹ kg and charge = 1·6×10⁻¹⁹ C) enters perpendicularly into the Earth's magnetic field (5×10⁻⁵ T). Its Larmor radius is
- A 5·93 mm
- B 5·93 m
- C 6·75 mm
- D 6·75 m ✓
✓ Correct answer: (D)
Science & Technology › Physics & Chemistry
NDA2020
Consider the following image : A proton enters a magnetic field at right angles to it, as shown above. The direction of force acting on the proton will be
- A to the right
- B to the left
- C out of the page
- D into the page ✓
✓ Correct answer: (D)
Science & Technology › Physics & Chemistry
Study how UPSC repeats — not just the papers
₹199 / 1 year · Founding Member
Full access unlocks the three things no PYQ PDF gives you:
① Cross-exam learning — see the same idea recur across CSE, CAPF, CDS and NDA.
② Topic evolution — how each idea is framed, year by year.
③ Question intelligence — every PYQ + answer, linked to related concepts and similar questions.
e.g. Round Table Conference: CDS 2017 → CSE 2017 → … → CAPF 2024
15 days free, no card required — then ₹199 for 1 year.
Start your 15-day free trial →