AP EAPCET 25-Aug-2021 Shift 1 Paper

When a copper rod is moved in magnetic field, an emf is induced in such a way that current induced will try to oppose the motion of the rod.
As we know,
e∝

d ϕ

dt

⇒iR∝

dϕ

dt

(∵e=iR)
⇒

dQ

dt

×R∝

dϕ

dt

(∵i=

dQ

dt

)
⇒

dQ

dt

∝

dϕ

dt

Hence, charge developed across the ends of the rod will be proportional to rate of change of magnetic flux.