JK BOSE OLD PAPER OF CLASS 12TH PHYSICS PAPER 2017 PDF DOWNLOAD

JK BOSE OLD  PAPER OF CLASS 12TH PHYSICS PAPER 2017 PDF DOWNLOAD 

JK BOSE OLD  PAPER OF CLASS 12TH PHYSICS PAPER 2018 PDF DOWNLOAD 

• TIME : 3 HOURS]                                               MAXIMUM MARKS : 70 

                               LONG ANSWER TYPE QUESTIONS 

1.     Find an expression for magnetic force on a current carrying conductor in an uniform  magnetic  field. When is this force minimum and maximum ?

                                                                        Or

Define magnetic dipole moment. Derive an expression for magnetic field intensity due to a magnetic dipole at a point perpendicular to its axis.

2.     Derive an expression for average power in LCR circuit connected to an A.C. supply. Hence define power factor.

                                                                        Or

State and explain Lenz's law. How will you verify it experimentally?

3.     Derive an expression for the magnifying power of an Astronomical telescope with the help of a ray diagram.

                                                                       Or

       Derive an expression for the fringe width in Young's double slit experiment of interference.

4.     Explain the forward and reverse bias characteristics of a p-n junction diode.

                                                                      Or

        Draw an OR gate using two diodes and explain its working. Write truth table for the OR gate.

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