induced E

are d four options correct............ i think its proportional to 1/r³

yes dear :) absolutely corect options... no typo :)

i think ans is a) 1/r

then is it option 3) ?????????????

well, for this , there must be a condition on B,
it must only be a function of time.

plz plz plz........ explain it.........

plz plz plz........ explain it.........

dΦ = ∫E.dl
dt

as E is same for circular region passing over P..

so
dΦ = E.∫dl
dt

AdB/dt=E2Ï€R

E=A(dB/dt)
2Ï€R

so E α 1/r