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# (a) Sketch the electric field lines around an isolated point charge $q>0$ , (b) Sketch the electric field pattern around an isolated negative point charge of magnitude - 2$q$

## From the above figure number of lines terminating on charges $-2 q$ is twice the number of lines $\text { in fig a (for charge } 1 q)$

### Discussion

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##### Andy C.

University of Michigan - Ann Arbor

##### Aspen F.

University of Sheffield

### Video Transcript

in this problem. On the topic of electric forces and fields, we are asked to sketch the electric field lines around an isolated point charge Where Q is greater than zero. We then want to sketch the electric field pattern around an isolated negative point charge with twice the magnitude or minus two. Q. So for a positive charge. Q. We have the field lines, which are pointing readily outward, and so we can draw the field lines as follows, and this is for a positive charge. Q. So Q is greater than zero now for Part B, we want to draw these field lines for a negative charge of magnitude minus two Q. So it will be readily inward, and we'll have twice as many since the magnitude of the charges now doubled. So if we draw our field lines, they are now readily inward, pointing towards the charge of minus two. Q. So the electric field lines originating positive charges and terminate our negative charges, and the density of the lines is twice as great for the minus two cute charge as it is for the one Q charge

University of Kwazulu-Natal
##### Andy C.

University of Michigan - Ann Arbor

##### Aspen F.

University of Sheffield