CBSE-XI-Physics
38: Electromagnetic Induction
- #7Consider the following statements:
(A) An emf can be induced by moving a conductor in a magnetic field.
(B) An emf can be induced by changing the magnetic field.
(a) Both A and B are true.
(b) A is true but B is false.
(c) B is true but A is false.
(d) Both A and B are false.digAnsr: aAns : (a) Both A and B are true.
Statement A is true, as an emf can be induced by moving a conductor with some velocity v in a magnetic field B. It is given by
`` e=Bvl``
Statement B is true, as an emf can be induced by changing the magnetic field that causes the change in flux Ï• through a conductor or a loop. It is given by
`` e=-\frac{d\varphi }{dt}``
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