MHT CET202120 Sep 2021Morning ShiftPhysicsElectromagnetic InductionActual
A metal wire of length 2500 ~m is kept in east-west direction, at a certain height from the ground. If it falls freely on the ground, then the current induced in the wire when its speed is 10 ~m / s is (Resistance of wire =25 , g=10 ~m / s ^2 and Earth's horizontal component of magnetic field 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
Emf induced, e = B _ H l aligned & =2 10⁻⁵ 10 2500=0.5 ~V & I = e / R =0.5 / 25=0.02 ~A aligned