KCET2023PhysicsElectromagnetic Induction
A metallic rod of length 1 ~m held along east-west direction is allowed to fall down freely. Given horizontal component of earth's magnetic field B_H=3 10⁻⁵ ~T . the emf induced in the rod at an instant t=2 ~s after it is released is (Take, g=10 ~ms ⁻² )
Options
- A6 10⁻⁴ ~V
- B3 10⁻³ ~V
- C3 10⁻⁴ ~V
- D6 10⁻³ ~V
Correct answer
C. 3 10⁻⁴ ~V
Step-by-step solution
Given, B_H=3 10⁻⁵ ~T l=1 ~m Height travelled by rod in t=2 ~s h= 1 2 g t^2= 1 2 10 2^2=20 ~m Speed of rod, v= h t = 20 2 =10 ~m / s Hence, induced emf aligned e & =B_H v l=3 10⁻⁵ 10 1 & =3 10⁻⁴ ~V aligned