00:01
In this particular question we have five parts.
00:02
For each part we have to answer whether the statement is true or not.
00:06
Firstly, for part a.
00:14
Now for the first part the statement is incorrect.
00:21
Okay? because stationary charges create stationary electric fields only.
00:33
Because stationary charges create stationary field only.
00:52
Now for second, the statement is correct.
01:10
Now, let's understand this mathematically because of this formula, magnetic force is equal to q times v cross v.
01:20
That can be written as qvb sine theta.
01:25
Now, if a particle moves along the magnetic field, then theta between velocity vector and the magnetic field vector is 0 degree.
01:32
And we know that sine theta is equal to 0, so the magnetic force will be 0.
01:35
That is the reason now for the third part the statement for the third part is incorrect because the electric field lines denote the direction of the electric field at the same point the same goes to the magnetic field it does not direct into the direction of force this is a reason electric field field line denote the direction of the the electric field at that point.
02:42
Same goes to the magnetic field...