A proton and an electron enter a uniform magnetic field with same velocity perpendicular to field. Which has larger radius? MCQ with Answer and Explanation

Explanation:
Geostationary: orbit period = Earth's rotation period (24 h), equatorial plane, appears fixed. Orbital radius ≈ 42,000 km from Earth center. Memory tip: 'Geostationary: T=24h, equatorial, fixed position; communication satellites'. Orbital mechanics fact frequently tested in competitive exams.

Explanation:
Acceleration phase: s₁ = ½a t² = ½×2×100 = 100 m, v = a t = 20 m/s. Constant velocity phase: s₂ = v×t = 20×10 = 200 m. Total = 300 m. Motion in two parts.

Explanation:
Torque = r × F => [L][MLT⁻²] = [ML²T⁻²], same as work.