MHT CET20239 May 2023Morning ShiftPhysicsMagnetic Effects of CurrentActual
A conducting wire of length 2500 ~m is kept in east-west direction, at a height of 10 ~m from the ground. If it falls freely on the ground then the current induced in the wire is (Resistance of wire =25 2 , acceleration due to gravity g =10 ~m / s ^2, ~B _ H =2 10⁻⁵ ~T )
Options
- A0.2 A
- B0.02 A
- C0.01 A
- D2 A
Correct answer
B. 0.02 A
Step-by-step solution
aligned & We know, e = B / v & v ^2=2 gh v & = 2 gh e & = (2 10⁻⁵ ) 2500 2 10 10 & = (2 10⁻⁵ ) 25000 2 & =2 2 25 10^3 10⁻⁵ & =50 2 10⁻² ~V I & = e R = 50 2 10⁻² 25 2 =2 10⁻²=0.02 ~A aligned