Example 7: The experiments set-up given below measures the value of unknown resistance in two steps. Switch 2 R G • When V=24 V, r is set at 400 52 and 5=8052, galvanom- eter shows a deflection of 30°. The value of unknown resistance Ris (Λ) 80 Ω (C) 40 S • When switch is thrown to position 2 the supply voltage drops down to 22 V and the galvanometer still shows a deflection of 30°. (B) 60 (D) None of the above

Delmar's Standard Textbook Of Electricity
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Chapter29: Dc Generators
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Example 7: The experiments set-up given below measures
the value of unknown resistance in two steps.
S
V
Switch www
2
R
G
• When V = 24 V, r is set at 400 52 and 5=802, galvanom-
eter shows a deflection of 30°.
• When switch is thrown to position 2 the supply voltage
drops down to 22 V and the galvanometer still shows a
deflection of 30°.
The value of unknown resistance Ris
(A) 80 22
(C) 40
(B) 609
(D) None of the above
Transcribed Image Text:Example 7: The experiments set-up given below measures the value of unknown resistance in two steps. S V Switch www 2 R G • When V = 24 V, r is set at 400 52 and 5=802, galvanom- eter shows a deflection of 30°. • When switch is thrown to position 2 the supply voltage drops down to 22 V and the galvanometer still shows a deflection of 30°. The value of unknown resistance Ris (A) 80 22 (C) 40 (B) 609 (D) None of the above
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