Emi

[amber lance]

Yall where am i going wrong with this?

[pastel slate]

<@&1227987967939838003>

Note for OP

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[amber lance]

Heres my attempt

Answer is option ||C|| seems like they got it if u take velocity as directly omega *R instead of what i have taken, then u get answer but we have to take component perpendicular to velocity right?

[scarlet cove]

should be sinalpha? cuz we need bparallel?

[scarlet cove]

idt we can take romega.. it's rotating about y axis right

[amber lance]

Yes see again i was confused abt it, idts we can take r*omega cuz its rotating abt y axis so shoult it be rsin(theta) * omega

[amber lance]

No its dot product between b net and dl so it should be cos(alpha) right? Aka b perpendicular cuz we need component along dl or lenght on arc

[warm olive]

oh meine galat axis lelia

i took Bradial wrong as well

Ismein kuch galat hai??

[amber lance]

Here why did u take radial comp shoultne it be tangential as acc to formuka is (vxB).dl which means we need to take component of B along dl (arc lenght) so isnt tht tangential component of B?

[warm olive]

i just used e= BVl where B V l all are perpendicular to each other

didnt think about B cross V

[amber lance]

Bruh but think abt it v cross B is simpli vB since v is out of plane so they both perp, issues comes with dot producct do check it nd think once using this

[warm olive]

ill try

a t=0 we take velocity vector as omega R sintheta -k cap ?

Bvector toh aa jayega

[warm olive]

v cross B and dl ke beech ka angle ?

[amber lance]

yea i found that out to be alpha ( v cross b is just v * Bnet)

and if u do Bnet * co(alpha) dl it will just yeild u tanential component of B

[scarlet cove]

Isn't the formula (v x B).l (all vectors)? When you take sinalpha u do get the right ans.. I'm not sure though

And yeah like all three have to be perpendicular to each other.. so shouldn't it be Bparallel

[amber lance]

yea lol i got it now i was making a silly mistake, v cross B acctually gives a direction perp to Bnet which makes an angle of 90-alpha with dl so dot product would just give Bv * sin(alpha) dl

[fringe jackal]

@amber lance ok here?

[amber lance]

+solved @warm olive @scarlet cove