drift velocity

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I.S.C. Board Question Paper. Physics, Class XII – 2009 ( C.I.S.C.E. )

Question 1 
Answer all question briefly and to the point.

(i)
Explain the statement ‘relative permittivity of water is 81’.

(ii)
Draw (at least three) electric lines of force due to an electric dipole.

(iii)
Find the value of resistance X in the circuit below so that the junction M and N are at the same potential.

(ix)
A ray LM of monochromatic light incident normally on one refracting surface AB of a regular glass prism ABC emerges in air from the adjacent surface AC as shown in Figure. Calculate the refractive index of the material of the prism.

SECTION A
(Answer any two questions)

Question 2 
(a)
With the help of a labeled diagram, obtain an expression for the electric field intensity ‘E’ at a point P in broad side position (i.e. equatorial plane) of an electric dipole.

Question 3
(c)
(i) State any two differences between a moving coil galvanometer and a tangent galvanometer.

(ii) What is the use of a Cyclotron?

SECTION C
(Answer any two questions)

Question 8
(a)
Electrons, initially at rest, are passed through a potential difference of 2 kV. Calculate their:

(i) Final velocity and

(ii) de Broglie wavelength

read more I.S.C. Board Question Paper. Physics, Class XII – 2009 ( C.I.S.C.E. )

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Physics midterm exam, for class XII (ISC-II) for C.I.S.C.E. board.

PART-I
Total 10 marks
Each question carries 1 mark.  Answer all. (10)              

Question 1 [Objective, 10 X 1]
(a)
Which of the following drops faster?

A. an electric dipole‘s electric field                      B. an electric dipole‘s electric potential

C. a point charge’s electric field                            D. a point charge’s electric potential

read more Physics midterm exam, for class XII (ISC-II) for C.I.S.C.E. board.

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Physics midterm, for class XII, for C.B.S.E. and State boards.

Question 1
Which of the following drops faster?

A. An electric dipole’s electric field                      B. An electric dipole’s electric potential

C. A point charge’s electric field                            D. A point charge’s electric potential

Question 4
Chose the correct one

A. Kirchhoff’s loop rule is applied to a junction of incoming and outgoing current?

B. According to Kirchhoff’s loop rule a junction of incoming and outgoing current carries a potential proportional to the amount of current flowing through the junction.             

C. Kirchhoff’s junction rule can be applied to a single current carrying path in any electric circuit.

D. The potential drop in a loop in any electric circuit is zero and its based on conservation of energy.

Question 5
Chose the correct one

A. Resultant of capacitance in series is more than individual resistances

B. Current division works on the basis of direct proportionality of resistances

C. Voltage division works on the basis of direct proportionality of resistances

D. Resistors in series will add up

PART-B

Question 2
Describe de-Broglie wavelength in 1 or 2 lines and write the formula that we use for this idea.

Question 6
Give example of 3 conservative forces. A conservative force is defined through the following; “The work done in a conservative force field during a circular voyage is zero, as such work done are independent of the path taken”.

PART-C

Question 1
Define electric current and electric current density. State and explain Ohm’s law. Derive an expression for drift velocity.

Question 7
Derive the magnetic field B of a toroid by using Ampere’s circuital law.

PART-D

Question 13.
State the mirror equation and thin lens formula. Derive the lens formula with a suitable diagram.

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