00:01
In problem number 1, we have given which of the following conditions is the net magnetic force on a charge particle is equal to 0.
00:10
So we know that magnetic force is equal to q, v, b, sine theta.
00:15
So in option a we have given when the particle is stationary, yes, when v is equal to 0, you can say the magnetic force will be 0.
00:26
And in option b, we have given when the particle is moving parallel to the magnetic field yes this is also correct because when velocity is parallel to the magnetic field this angle theta is equal to zero the magnetic force will be zero now in option c we have given when the particle is not charged when q is zero we can say this magnetic force will be zero in option d we have given when the particle in option d we have given all of the above so the correct option will be all of the above.
01:09
Okay, option d is correct.
01:11
Now in problem number two, we have given all of the following statements about magnetic field lines around a permanent magnet are true except which one.
01:31
The magnetic field lines appear to end at the north hole of a magnet.
01:36
Magnetic field lines have no beginning or end...