Page 50 - Physics - XII

Table for determination of resistance of inductor

S. Battery Without iron core With soft iron core
No. eliminator D.C. D.C. V D.C. D.C. V ′′
reading Voltmeter Milliammeter R= I Voltmeter Milliammeter ′′ R= I'
reading reading I (Ω) reading reading I' (Ω)
V (volt) (mA) V' (volt) (mA)

1.
2.
3.
4.

Mean value of R = _____ Ω
Mean value of R' = _____ Ω

2. Determinati on of Impedance of an Inductor
(a) Without soft iron core:

6. Connect the step-down transformer with tapping of (2 V, 4 V, 6 V), an A.C. milliammeter
and inductor coil in series and A.C. voltmeter in parallel with the inductor coil as shown
in the Fig. 1.1(c).
7. Now, repeat the steps 2 and 3 and note the observations. After taking the observations, switch
off the A.C. supply.
(b) With soft iron core:

8. Introduce the given soft iron core in such a way so that the iron core is fully inside the
inductor coil.
9. Now, repeat the steps 2 and 3 and note all the observations.

Observations

Range of A.C. voltmeter = 0 to _____ V Range of A.C. milliammeter = 0 to _____ mA
Least count of A.C. voltmeter = _____ V Least count of A.C. milliammeter = _____ mA
Table for determination of impedance of Inductor coil

S. Step-down Without iron core With soft iron core
No. transformer A.C. A.C. V A.C. A.C. V'
reading Voltmeter Milliammeter Z == I a.c. Voltmeter Milliammeter Z' == I' a.c.
reading reading I a.c. (Ω) a.c. reading reading I' a.c. (Ω) a.c.
V (V) (mA) V' (V) (mA)
a.c.
a.c.
1.
2.

3.
4.
Mean value of Z = _____ Ω
Mean value of Z' = _____ Ω

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