CBSE Class 12 physics Important Questions …

CBSE Class 12 physics Important Questions Chapter 14 Electronic Devices 1 Mark Questions 1.Give the ratio of number of holes and the no. of conduction electrons in an intrinsic semiconductor. Ans.(As in intrinsic semiconductor ne = nh) 2.What type of impurity is added to obtain n-type semiconductor? Ans. Pentavalent atoms like Arsenic (As) 3.Doping of silicon with indium leads to which type of semiconductor? Ans.Indium is a trivalent impurity, thus doping of silicon with indium leads to p-type semiconductor. 4.Draw an energy level diagram for an intrinsic semiconductor? Ans.In intrinsic semiconductor (ne = nh) 5. A semiconductor has equal electron and hole concentration of. On doping with a certain impurity electron concentration increases to. Identify the type of semiconductor after doping? Ans.As ne > nh, thus resulting semiconductor is of n-type. 6.How does the energy gap of an intrinsic semiconductor vary, when doped with a trivalent impurity? Ans. When a trivalent impurity is added to an intrinsic semiconductor, an acceptor energy level is created in the forbidden energy gap which lies above the valence band. Due to this electrons easily transformed to the acceptor energy level. 7. How does width of depletion layer of p.n junction diode change with decrease in reverse bias? Ans.Decrease in reverse bias will decrease in width of the depletion layer. 8. Under what condition does a junction diode work as open switch? Ans. A junction diode works an open switch when it is reverse biased. 9. Which type of biasing gives a semiconductor diode very high resistance? Ans.Reverse biasing

What is pseudo force

Draw electric field lines for two negative charges infront of each other

Consider the charge q ,q and -q placed at the vertices of an equilateral triangle as shown in fig . what is the force on each charge

Question 1)A ball is dropped from a height of 20 m above the surface of the water in a lake. The refractive index of water is 4/3. A fish inside the lake, in the line of fall of the ball, is looking at the ball. At an instant, when the ball is 12.8 m above the water surface, the fish sees the speed of the ball as g = 10m/s2. (A) 9 m/s (B) 12 m/s (C) 16 m/s (D) 21.33 m/s Answer with Explanation plz

Automobile ignition failure occurs in damp weather. Explain why .

What is the net force on each charge if q , q and -q

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5 8 4 6 Find force on -q and q 2 3 4 Fnd force on -q and 2q Answers 27Kq" 4r SKa (-) 29 294 For leftmost. F = h()& For middle, F = 9r4 189/86 7. Find the valuc of r such that the forcc cxperiencc by the charge Q will be maximum? Ir0= 30°, q, = -10-6C, q2=3X 10C, q3 = -2 x 10C, r2 = 15 cm, ry3= net force on charge qi? For -q. F -(& For 2q. F 5. Find the ratio of magnitude of force 3Kq 20 2r2 ( 2.9 27 6. For q. F 7. r= 2.1 8. 2.64 N F. VSKq' 10 cm Find & For -q. F VIDYAPATH BY: ABHIMANYU KUMAR (IWT BOMBAY),76942oes

Calculate the field due to a electric dipole of length 10cm having the charges 1micro coulomb at an equatorial point 12cm from the center of the dipole

Find the electric flux through a square face of side 10cm in yz plane if the electric field is E =300i^NC¹