A resistance of 2 Q is connected across one gap of a metre-bridge (the length of the wire is 100 cm) and an unknown resistance, greater than 2 2, is connected across the other gap. When these resistances are interchanged, the balance point shifts by 20 cm. Neglecting any corrections, the unknown resistance is (A) 32 (B) 4 2 (C) 52 (D) 6 2 ver (A) (B) (C) (D)
A resistance of 2 Q is connected across one gap of a metre-bridge (the length of the wire is 100 cm) and an unknown resistance, greater than 2 2, is connected across the other gap. When these resistances are interchanged, the balance point shifts by 20 cm. Neglecting any corrections, the unknown resistance is (A) 32 (B) 4 2 (C) 52 (D) 6 2 ver (A) (B) (C) (D)
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Transcribed Image Text:A resistance of 2 2 is connected across one gap of a metre-bridge (the length of the
wire is 100 cm) and an unknown resistance, greater than 2 2, is connected across
the other gap. When these resistances are interchanged, the balance point shifts by
20 cm. Neglecting any corrections, the unknown resistance is
(A) 32
1.
(B) 4 2
(C) 52
(D) 62
Answer
(A)
(В)
(C)
(D)
2.
In an experiment to determine the focal length (f) of a concave mirror by the
u-v method, a student places the object pin A on the principal axis at a distance x
from the pole P. The student looks at the pin and its inverted image from a distance
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