Week 14 Hw 2 Essay

1167 Words Apr 6th, 2011 5 Pages
ELECTRICITY AND MAGNETISM Week 14: Homework 2 1. A spark can jump between two non – touching difference between them is sufficiently large. approximately 940 V is required to produce a spark How fast would a 1.3 m rod have to be moving in cause a spark to jump across the gap? [151 ms-1] conductors if the potential A potential difference of in an air gap of 1.0 × 10-4m. a magnetic field of 4.8 T to

2.

The wingspan (tip – to – tip) of a Boeing 747 jetliner is 59 m. The plane is flying horizontally at a speed of 220 ms-1. The vertical component of the Earth’s magnetic field is 5.0 × 10-6 T. Find the emf induced between the wing’s tips. [6.49 × 10-2 V] Near San Francisco, where the vertically downward component of the earth’s magnetic
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The only resistance in the circuit ABCD is 4.0 Ω in the arm DC. An applied force Fa is moving the rod to the left at a constant velocity of 8.0 ms-1.

a. b. c. d. e. f. 8.

What is the emf induced between the ends of AD? [4.0 V] In which direction does the induced current flow in DC? [from C to D] What is the current in DC? [1.0 A] Specify fully the magnetic force Fm acting on AB? [0.50 N to the right] What is the net force acting on AB? [0] If the frictional force between the rod and the rails is negligible, specify fully Fa. [0.50 N to the left]

A magnetic field of uniform flux density B is established in a horizontal direction above a certain horizontal line XY. Below the line XY the field is zero. A square wire frame of side L, mass m and resistance R, is placed par inside and part outside the field with the sides perpendicular to the field as in the figure below. It is projected downwards with an initial velocity v.

Calculate: a. the initial current in the frame. [vLB/R] b. the value for v which there would be no subsequent acceleration of the frame while portion of it is still above the line XY. [v = mgR/L2B2]

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9. 10. 11. 12. 13. 14. 15.

Question 4, Section 4.2 (page 130) from text. Questions 5 - 6, Section 4.2 (page 130) from text. Questions 5 – 7, Chapter Review (page 151) from text. Questions 8 – 9, Chapter Review (page 151) from

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