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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
- A 220 volt and 1000 watt bulb is connected across a 110 volt mains supply.
- Watt hour mter measures
- Electrons with energy 80 keV are incident on the tungsten target of an X-ray tube.
- If a star converts all helium in its core to oxygen, then energy released per oxygen
- The total energy of a particle executing SHM is 80 J
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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