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Himanshu posted an Question
July 25, 2020 • 04:57 am 30 points
  • IIT JAM
  • Physics (PH)

Magnetism.

Q.1 (Pic.1)For induced current they told it not depends upon time but from the equation it is clearly, how??? Q.2 (Pic.2) the highlighted line is true for that particular case only right ???? because for the other cases motion is in the direction of force so not possible to be perpendicular correct or not ???

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  • comment-profile-img>
    Ruby negi

    ques 2) highlighted line is talking about only magnetic force because m.f is q V cross B means cross product so M.F is always perpendicular to V and B, any force which is defined as cross product is always perpendicular to the terms which included in cross product.. so u can say this is special case as all the forces(Electrostatic, gravitational) we learn before are not defined in cross product form.. in 1st question, induced current depend on rate of change of flux where flux is defined as B.A so if m.f or area will change, induced current also change...

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    Somnath Best Answer

    First one is typing mistake.For your second query you want to know is magnetic force perpendicular to the velocity for always or for that perticular case only. We know magnetic force F=q(V×B).Here all the capital letters are vector.we also know if A and B are two vector then their cross product is also a vector in the direction perpendicular to both A and B.Thus since F is cross product of V and B, F is always perpendicular to V and B both.It is true for all the cases not only for a particular case.Magnitude of V×B=|V||B|Sinx.Where x is the angle between V and B.If V is parallel to B then x=0 and F=0 (This is the minimum force).If V is perpendicular to B then x=90 and F=|V||B| (This is the maximum force).Except F=0 for all the cases F is always perpendicular to V.

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  • comment-profile-img>
    Ravi prakash yadav best-answer

    induced current depends on change in flux with respect to time where flux is given as B.dA. So if we change either magnetic field (B) or area (dA) with respect to time,the induced current will be there. Now in 2nd question,the force is perpendicular to the motion in magnetic force case only. You can see that v is the velocity and B is the magnetic field then the force is given be F=q(v×B). Now clearly cross product of two vectors is perpendicular to the both the vectors. Hence force F will be perpendicular to both v and B. Hence magnetic force F is perpendicular to v always. However it is not true in other cases like electrostatic force, gravitational force etc.

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    Dhairya sharma

    and in second arrow we know magnetic force F = q(V×B) which would be perpendicular to plane if v and B

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