BSc Physics SEM II 2018 19 May 2018-19 PHYSICS PAPER II Question Paper - Mumbai University | munotes

Questions asked in this paper

1. Q2 Use of non- programmable calculator is allowed
2. Q4 Symbols have their usual meanings unless mentioned
   • (A) Select the correct option 12
   • i) In case of pure capacitor connected to ac.source, phase angle between capacitor voltage and current is degrees
   • ii) bridge is used to determine frequency of ac source
   • (c) Maxwell (d) Hay In half adder circuit, sum and carry are represented by outputs of and gates respectively
   • (a) AND, OR (b) Ex-OR, AND
   • (c) Ex-OR, OR (d) NAND, NOR
   • iv) The source delivers maximum power to the load when source resistance is
   • (a) greater than load (b) less than load
   • (c) equal to load (d) equal to zero
   • v) When charge Q is accelerated through a potential difference V, it gains
   • vi) The resultant field between the two coils of Helmholtz coil arrangement is inversely proportional to the
   • (a) current (b) permeability of free space
   • (c) number of turns (d) radius
   • (B) Answer in one sentence : 03
   • i) Why LCR parallel circuit is called as a rejecter circuit?
   • ii) Define efficiency of a rectifier
   • iii) What is the magnitude of electric field on the equipotential surface? Fillin the blanks 05
   • i) The quantity is called as inductive reactance
   • ii) internal resistance of ideal current source is
   • iii) sum of half adder is represented by gate
   • iv) The ripple factor of bridge rectifier is
   • v) SI unit of electrostatic potential is
   • (A) Attempt any one 08
   • i) A sinusoidal voltage is applied across series LR circuit. Show that current lags behind the applied voltage. Draw series relevant phasor diagram
   • ii) expression for the instantaneous power dissipated by an ac circuit Hence define true power and derive expression for it
   • (B) Attempt any one 08
   • i) Draw a neat labeled diagram of Maxwell LC bridge and find balancing conditions of the bridge
   • ii) With the help of circuit diagram determine balancing condition for De Sauty’s bridge. State one application of the bridge
   • (C) Attempt any one 04
   • i) LCR circuit, resonance occurs at frequency 10 KHz. If R= 10Q and inductive reactance is 200Q at resonance. Find the bandwidth of the circuit
   • ii) In wien bridge both the resistors and capacitors are of same value. If R= and C = then find the frequency of the ac source used
3. Q3 (A) Attempt any one 8 marks
   • i) State Thevenin’s theorem and explain it in detail
   • ii) What are the binary adders? Describe full adder in detail
   • (B) Attempt any one 08
   • i) What is a clipper? What are its types? Explain working of any one type of clipper with the help of diagram
   • ii) State and prove De Morgan’s laws
   • (C) Attempt any one 04
   • i) Simplify the expression Y = (A+B).(A+C) and design logic circuit for the
   • ii) Find the Zener current when Zener diode of voltage 7.2 V is connected across a power supply of 12 V and series resistance of 1 KQ. The load resistance of 5 KQ is connected across the Zener
4. Q4 (A) Attempt any one 8 marks
   • i) Obtain an expression for the potential energy stored in a system of N discrete
   • ii) Explain how electric field can be expressed in terms of electric potential comment on the potential
   • (B) Attempt any one 08
   • i) Derive an expression for the magnetic field at a point at a distance x from a straight current carrying wire of finite length. Modify the result for infinitely
   • ii) What is a solenoid? Derive an expression for the magnetic field at a point well inside on the axis of a current carrying air core solenoid
   • (C) Attempt any one 04
   • i) Find the work done in moving a charge of from (2,0)m to (0,2)m alonga straight line path joining these two points in electric field
   • ii) coil having 30 turns carries a current of 0.5A. If the diameter of the 0.1 m, calculate the magnetic field at the centre of the coil. Given:
5. Q5 Attempt any four 20 marks
   • i) An ac source specified as V = 200 sin 100t is connected across series CR circuit with C = and R = 10KQ. Calculate maximum potential difference across the capacitor
   • ii) In a Maxwell LC bridge, when bridge is in the balanced, the following component values were observed. Rz = 9000, R3=10000, 27000 and C = 0.47uF. Determine the value of inductance and the resistance of the coil
   • iii) State maximum power transfer theorem. Calculate the maximum power delivered to the load of 1 KQ by a source with open circuit voltage 5V
   • iv) Explain why NAND gate is called as universal building block
   • v) State and explain Biot-Savrot law
   • vi) charged spherical shell of radius R carries a total charge q. Find the electrostatic potential at a point P,(i) outside and (ii) inside the shell

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