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EMI reg motional emf
1. when a moving rod in uniform B generates emf, does it follow any Faraday law ie change of B/A/angle.
2. In motional emf, even if rod connected with external resistor through connecting wires moves moves along with complete circuit without sliding over wire ie without change of area/ without sliding over wires in uniform B generates emf?
Sir, my doubt is not clear.
1.lets come to motional emf concept first which states that when a rod moving with velocity v in a uniform B perpendicular to it then rod produces motional emf =Blv.(Agreed/Not Agreed)
2. Now some R with connecting wires is connected across rod & rod moves same like point no 1 above, it should produce emf =Blv as per motional emf concept.(Agreed/Not Agreed)
3. But Faraday law states that emf is produced only when there is change in B/A/angle. In point no 2 above there is no change in B/A/angle, then as per Faraday law there should not be any emf but as per motional emf concept & point no. 1/2 above the emf equivalent to a battery=Blv is produced. So both contradicting, please clarify.
pl clarify pointwise…
1. The emf is generated because of the change in flux linked through any rod. When a rod initially enters the region of uniform magnetic field. The flux linked through the rod changes because magnetic field is changing, when it completely enters the magnetic field so there is no emf because magnetic field does not changes and when the rod moves out of the field, the flux changes because magnetic field increases due to which emf is generated.