Ch20CT - Chapter 20 Concept Tests. Reading Quiz: Pick the...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 20 Concept Tests. Reading Quiz: Pick the answer which is most nearly correct. Magnetic fields are caused by. .. A) stationary electric charges. B) magnetic monopoles. C) moving charges (currents) . D) particles with both mass and charge. E) None of these is correct.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Q20-1 A negative particle and a positive particle are moving with certain velocities in a constant, uniform magnetic field B , as shown. The direction of the B- field is to the right. The (+) particle is moving directly left; the (–) particle is moving directly up. The forces on the two particles are (in = into page, out = out of page). A) + in – zero B) + out – in C) + zero – out D) + zero – in E) None of these. Answer: The (+) particle is moving anti-parallel to the B-field. The angle θ is 180 and the force is F B =qvB sin θ = 0. The (-) particle is moving at right angles to the field. By the right-hand rule, the direction of the force is out of the page. B +
Background image of page 2
A positive particle is released from rest in a region of space where there is constant, uniform, electric field E , and a constant, uniform magnetic field B . The electric field points up and the magnetic field points out of the page in the diagram below. Which path will the positive particle follow? The work done by the magnetic field on the particle is. . A) positive B) negative C) Zero. Answer: The (+) particle will feel a force F E = qE due to the E-field along the direction of the E-field. As it starts moving along the E-field direction, it will acquire a velocity, and it will start to feel a force F B =qvB, due to the B-field. The direction of the force is to the right, by the right-hand-rule. E
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This document was uploaded on 12/09/2009.

Page1 / 11

Ch20CT - Chapter 20 Concept Tests. Reading Quiz: Pick the...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online