question_answer

A 10 m long horizontal wire extends from North East to South West. It is falling with a speed of 5.0 m \[{{s}^{-1}}\], at right angles to the horizontal component of the earths magnetic field of \[0.3\times {{10}^{-4}}Wb/{{m}^{2}}.\] The value of the induced emf in wire is-  [JEE Main 12-Jan-2019 Evening]

A) \[0.3\times {{10}^{-3}}V\]

B) \[2.5\times {{10}^{-3}}V\]

C) \[1.5\times {{10}^{-3}}V\]

D) \[1.1\times {{10}^{-3}}V\]

Correct Answer: C

Solution :

[c] The motional emf is given as