Page 8 - Physics - XII

CONTENTS

SECTION - A

EXPERIMENTS

1. Current Electricity 9–25

Experiment - 1. To determine resistivity of two/three wires by plotting a graph for potential difference versus current. 9
Experiment - 2. To find resistance of a given wire / standard resistor using metre bridge. 13
Experiment - 3(a). To verify the laws of combination (series) of resistances using a metre bridge. 17
Experiment - 3(b). To verify the laws of combination (parallel) of resistances using a metre bridge. 19

2. Moving Charges and Magnetism 26–38
Experiment - 4. To determine the resistance of a galvanometer by half-deflection method and to find its 26
figure of merit.
Experiment - 5(a). To convert the given galvanometer (of known resistance and figure of merit) 28
into a voltmeter of desired range and to verify the same.
Experiment - 5(b). To convert the given galvanometer (of known resistance and figure of merit) 31
into an ammeter of desired range and to verify the same.
3. Alternating Current 39–45

Experiment - 6: To find the frequency of A.C. mains with a sonometer. 39

ACTIVITIES
Activity - 1: To measure the resistance and impedance of an inductor with or without iron core. 46
Activity - 2: To measure resistance, voltage (A.C./D.C.), current (A.C.) and check continuity of a given 49
circuit using multimeter.
Activity - 3: To assemble a household circuit comprising three bulbs, three (on/off) switches, 54
a fuse and a power source.
Activity - 4: To assemble the components of a given electrical circuit. 55
Activity - 5: To study the variation in potential drop with length of a wire for a steady current. 56
Activity - 6: To draw the diagram of a given open circuit comprising at least a battery, resistor/rheostat, 58
key, ammeter and voltmeter. Mark the components that are not connected in proper order
and correct the circuit and also the circuit diagram.

SECTION - B

EXPERIMENTS

4. Ray Optics and Optical Instruments 60–95

Experiment - 1: To find the value of v for different values of u in case of a concave mirror and 60
to find the focal length.
Experiment - 2: To find the focal length of a convex mirror, using a convex lens. 64

Experiment - 3. To find the focal length of a convex lens by plotting graphs between u and v or between 1/u and 1/v. 66
Experiment - 4: To find the focal length of a concave lens, using a convex lens. 71