# Mcdonald's in Vietnam

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• Published : February 5, 2013

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UNIVERSITI TUNKU ABDUL RAHMAN

CentreCourseYear/ TrimesterSession| : Centre for Foundation Studies (CFS): Foundation in Science: Year 1 / Trimester 2: 201210| Unit CodeUnit TitleLecturer| : FHSC1024: Thermodynamics and Electromagnetism: Mr. Lim Min Leong Mr. Chua Lai Choy Ms. Nurfadzilah Ms. NorHabibiSaadah Mr. Koh Pin Wai Mr. Yam Si Kin|

Additional Tutorial 9: Magnetism

1.(a)What is the magnitude of the force per meter of length on a straight wire carrying an 8.40 A current when perpendicular to a 0.90 T uniform magnetic field?
(b)What if the angle between the wire and field is 45.0°?
[Answer: (a) 7.6 N m–1; (b) 5.3 N m–1]

2.A 1.5 m length of wire carrying 4.5 A of current is oriented horizontally. At that point on the Earth’s surface, the dip angle of the Earth’s magnetic field makes an angle of 38° to the wire. Estimate the magnitude of the magnetic force on the wire due to the Earth’s magnetic field of 5.5 × 10–5 T at this point.

[Answer: 2.3 × 10–4 N]

3.A 5.0 MeV (kinetic energy) proton enters a 0.20 T magnetic field, in a plane perpendicular to the field. What is the radius of its path?