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### College Physics (Urone)

Book edition 1st Edition
Author(s) Paul Peter Urone
Pages 1272 pages
ISBN 9781938168000

# Repeat Exercise 22.1 for a negative charge.

(a) The direction of the force will be to the right (towards east).

(b) The direction of the force will be outside of the page (outwards or towards you).

(c) The direction of the force will be downwards (towards the south).

(d) No force.

(e) The direction of the force will be to the left (towards the west).

(f) The direction of the force will be upwards (towards north).

See the step by step solution

## Step 1: Definition of right-hand thumb rule.

The strategy to solve such problems with negative charges is assuming that the charge is positive, getting the direction of the force by the right-hand rule, after that we reverse the direction we got.

In summary, we will reverse every direction we got in the previous question.

## Step 2: Explanation of the direction of magnetic force.

(a)

By having the movement pointing down and the magnetic field pointing on the page, the force will be pointing to the left.

(b)

By having the movement pointing up and the magnetic field pointing to the left, the force will be pointing to the outside of the page or towards you.

(c)

By having the movement pointing to the left and the magnetic field pointing into the page, the force will be pointing to the south (downwards).

(d)

By having the movement pointing to the left and the magnetic field pointing to the right, the force will be zero (they are parallel and which will give ${}^{\mathrm{sin}\left({0}^{0}\right)=0}$, and therefore force will be zero).

(e)

By having the movement pointing into the page and the magnetic field pointing upward, the force will be pointing to the left in the west direction.

(f)

By having the movement pointing out of the page and the magnetic field pointing to the left, the force will be pointing to the north (upwards).