Connect the circuit at shown in the diagram above:-
Close the key k. read and record the emitters reading Io when the clip is not constant wire. Open the key with clip making constant with the constant wire when l=80cm. close the key read and record the ammeter and I.
Repeat the procedure with l=70,60,50,40 and 30 respectively in each case read and record ammeter reading I. evaluate I-1 .
Tabulate your readings.
plot a graph of I on the vertical axis against I-1 on the horizontal axis starting from the origin (0.0) Determine the slope S of the graph and its intercept C
Evaluate P=C/S. using your graph determine the current I when I=55cm.
State two precautions taken to ensure accurate result
Explain what is mean by potential difference between two point in an electric circuit.
State two factor on which the resistance of a wire depend.
The resistivity of a given wire of cross sectional area 0.7mm¬¬¬2 is 4.9×10-4 ohm’s
Calculate the resistance of two length of a wire…
I. Trace the outline ABCD of a glass block on a sheet of paper as shown above.
II. Remove the block mark a position very close to A draw the normal at the point N.
III. Draw the incident ray such that the angle of incidence i=20¬o
IV. Fix two pins at the point P and Q on the incidence ray
V. Replace the black and fix two other pins at R and S such the pins appear to be at P and Q when viewed through side D.C of the glass block.
VI. Remove the block and join the points at R and S producing the line to meet DC at F
VII. Join NF
VIII. Draw the normal EF, at F and produce it to meet the force AB at G
IX. Extend PG to meet the normal EF at H.
X. Measure and record in the table below NF and NH
Repeat the experiment i=30¬o,40¬o, 50¬o, and 60¬o in each case, measure NF and read your readings in the table below.
Plot a graph of NF on the vertical axis and NH on the horizontal axis. Determine the slope of the graph.
State two precautions to obtain accurate result
State Snell’s law of refraction