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A long straight wire carries a certain current and produces a magnetic field of 2 x 10⁻⁴ weber/m² at a perpendicular distance of 5 cm from the wire. An electron situated at 5 cm from the wire moves with a velocity 10⁷ m/s towards the wire along perpendicular to it. The force experienced by the electron will be (charge on electron = 1.6 x 10⁻¹⁹C)
Options
(a) zero
(b) 3.2 N
(c) 3.2 x 10⁻¹⁶ N
(d) 1.6 x 10⁻¹⁶ N
Correct Answer:
3.2 x 10⁻¹⁶ N
Explanation:
Given:
Magnetic field B = 2 x 10⁻⁴ weber/m²
Velocity of electron, v = 10₇ m/s
Lortenz force F = qvB sin
= 1.6 x 10⁻¹⁹ x 10₇ x 2 x 10⁻⁴ (θ = 90⁰)
= 3.2 x 10⁻¹⁶ N
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Topics: Magnetic Effects of Current and Magnetism
(167)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If force(F),velocity(v) and time(T) are taken as units, then the dimensions of mass are
- A heavy stone hanging from a massless string of length 15 m is projected
- When indensity of radiation is increased on a photosensitive plate, then
- For transistor action (1) Base, emitter and collector regions should have similar size
- A plane polarised light is incident normally on a tourmaline plate. Its E vector make
Topics: Magnetic Effects of Current and Magnetism (167)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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