Question

two simple pendulum suspended from same point making an angel X with each other charge on to Bob iger Q1 and Q2 (Q1 greater than Q2)
when pendulum immersed in liquid of density 500 kg per metre cube the angle between string remains same find dielectric constant of a medium if density of Bob 1000 kg per metre cube​

Answer 1

Explanation:

tanx=qE/mg

E=kq/d^2

d=m/v

m=d.v

given d=1000

m=1000v

tanx=k.q^2/d^2(1000v.g)..........(1)

when immersed in liquid

angle is same X

tanx=k.q^2/Ķd^2(mg-ρgh) {Ķ is electric const)

mg=ρ bob×v×g

mg=500vg

ρgh=1000vg

tanx=I.q^2/Ķd^2(500vg)...........(2)

dividing 1 and 2

ķ=2

electric constant =2