Q.1 Define drift velocity and derive an
expression for it and prove that I = neAVd
Q.2 State Kirchhoff’s laws and apply
it to derive Wheatstone’s bridge principle.
Q.3
Draw V - I graph for ohmic and non-ohmic materials. Give one example for each.
Q.4 Define the term
'resistivity' and write its S. I. Unit. Derive the expression for the
resistivity of a conductor in terms of number density of free
electrons and relaxation time.
Q.5 State the
principle of potentiometer. Draw a circuit diagram used to compare the e.m.f.
of two primary cells. Write the formula used. How can the sensitivity of a
potentiometer be increased?
Q.6 Two cells of
emf 1.5 V and 2 V and internal resistance 1 ohm and 2 ohm respectively are connected
in parallel to pass a current in the same direction through an external
resistance of 5 ohm. (i) Draw the circuit diagram. (ii) Using Kirchhoff's laws,
calculate the current through each branch of the circuit and potential difference
across the 5 ohm resistor.
Q.7 A cylindrical
metallic wire is stretched to increase its length by 5%. Calculate the percentage
change in its resistance.
Q.8
.
Q.9 (a) Define emf. of a cell? On what factors does it depend?
(b) Figure
below shows a 2.0v potentiometer used for the determination of internal
resistance of a 1.5v cell. The balance point of the cell in open circuit is 76.3cm.
When a resistance of 9.5 ohm is used in external circuit of
the cell the balance point shifts to 64.8cm length of the potentiometer.
Determine the internal resistance of the cell
Physics Classes By Er.Shyam Pachori add: C.L 81 D.D Nagar Mob.: 9039803981 Batches MWF Time: 3:30 - 5 pm
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