2nd Year Notes

Physics 2nd Year Chapter 4 to 15 Notes.pdf

Physics 2nd Year Chapter 4 to 15 Notes.pdf

Physics 2nd Year Chapter 4 to 15 Notes.pdf Second Year Physics Chapter No 15 Electromagnet Induction Questions from Chapter Q.No.1: Define electromagnetic induction Ans: When a conductor moves in a magnetic field then an emf is produced in it which is called induced emf and the current generated is called induced current. This phenomenon is known as electromagnetic induction. Q.No.2: Upon what factors the induced current depends? Ans: The induced current depends upon following factors (i) The speed of the conductor (ii) Resistance of the loop. Q.No.3: How the induced current can be increased? Ans: The induces current can be increased by (i) Using a stronger magnetic field (ii) Moving the conductor faster (iii) By increasing number of turns on coil Q.No.4: Name some methods in which emf is induced in a loop by producing a change in the magnetic flux Ans: There are some methods mentioned below in which an emf is induced in a loop by producing a change in the magnetic flux: i) Due to relative motion between magnetic and coil ii) By changing the area of coil in the uniform magnetic field iii) By rotating the coil of constant area in constant magnetic field iv) By phenomenon of mutual induction v) By using electromagnetic instead of permanent magnet Q.No.5: How the emf is produced? Explain Ans: The relative motion of conductor and magnet causes the induced emf. This relative motion changes the magnetic flux through the conductor. This change in flux induced the emf. Q.No.6: Define motional emf Ans: Definition: The emf induced by the motion of a conductor across a magnetic field is called motional emf. Formula: It is denoted by the given formula ε = vBL sinθ Q.No.7: State Faraday’s law of electromagnetic induction Ans: Statement: Faraday’s law states that “The emf induced in the coil of N loops is equal to the negative rate of change of flux with time” Formula: it is denoted mathematically as ε = −N ΔΦ Δt Q.No.8: What indicates the minus sign in the expression of Faraday’s law? Ans: The Faradays law is mathematically described as ε = −N ΔΦ Δt . The minus sign in this formula indicates that the direction of the induced emf is such that it opposes the change of flux. Q.No.9: State Lenz’s law

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