00:02
In this question here, we have given in 4a part is 7 figures.
00:08
So here let's start with first.
00:10
So here in this question, let us adopt a sign convention.
00:19
So here, right direction is here.
00:25
Right direction is positive x -axis i -cap and and left direction is negative x -axis, that is minus i -cap.
00:47
And upward direction was, upward direction is positive y -axis, that is j -cap.
01:00
And here, downward direction, downward direction is negative, y xx is minus j cap and out of the page out of the page is z direction that is positive z direction so that is k cap and into the page to the page here positive z direction so here it is negative k cap so in part let's start with first figure that is this one so here given is so in a here in a here given is b vector equals to b k cap and here v vector is v vector is equal to v minus j cap so here charge is positive so here charge is equals to q so here force on q is f vector equals to q q multiply by v vector cross b vector so here it will come q v b b minus j cap cross k cap so here it will come f vector equals to qub minus i cap hence the direction hence the direction is along negative x -axis it's two word left so here it's toward left now let's see b second figure so here in this given is so in this given is b b vector equals to b i cap and here v vector equals to v j cap so here force is f vector equals to q cap so here force is f vector equals to q v b j cap cross i cap so here it will come f equals to q vp multiply by minus k cap so here force force is into the page now let's see in c part here given is v vector equals to v i cap and v vector equals to v i cap and v vector equals to v minus k cap so so here force equals to force f vector equals to qvb i cap cross minus k cap.
04:33
So here when we solve it we get f vector equals to qvb j vector.
04:43
So here force is upward direction.
04:52
Now let's see d part here given is v vector equals to b i cap and here v vector equals to v minus i cap...