Question
A metal disc of radius 100 ~cm is rotated at a constant angular speed of 60 rad / s in a plane at right angles to an external field of magnetic induction 0.05 ~Wb / m ^ 2 . The emf induced between the centre and a point on the rim will be
BITSAT
Physics
Electromagnetic Induction
2021
BITSAT 2021
BITSAT Physics Question (2021) — Solution
Options
- A. 3 ~V
- B. 1.5 ~V
- C. 6 ~V
- D. 9 ~V
Answer
B. 1.5 ~V
Step-by-step solution
Induced emf produced between the centre and a point on the disc is given by array l e= 1 2 BR ^ 2 \\ =60 rad / s , B =0.05 ~Wb / m ^ 2 \\ and R =100 ~cm =1 ~m \\ We get e= 1 2 60 0.05 (1)^ 2 =1.5 ~V array
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