A letter `A` is constructed as a uniform wire of resistance 1 ohm/cm. The sides of the letter are 20 cm long and the cross piece in the middle is 10 cm long while the vertex angle is `60^(@)` the resistance of the letter between the two ends of the legs is
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A long cylinder of uniform cross section and radius R is carrying a current i along its length and current density is uniform cross section and radius
Correct Answer - `[(mu_(0)I r^(2))/(2 pi d (R^(2) - r^(2)))]`
2 Answers 5 views
A resistance box, a battery and a galvanometer of resistance `G` ohm are connected in series. the galvanometer is shunted by resistance of `S` ohm, fi
Correct Answer - `g^(2)//(g+s)`
2 Answers 1 views
The sides of a square ABCD are formed of wires, each of resistance r and B is joined to D by a wire of resistance 2r. Find the equivalent resistance o
Correct Answer - i) 2/3r, ii) r, iii) 2/3r
2 Answers 1 views
The resistance of a potentiometer wire 8 m long is 8 ohm. A high resistance box and a 2-volt accumulator are connected in series with it. What should
Correct Answer - 1992 `Omega`
2 Answers 2 views
vi)A metallic wire of length \( L \) and cross sectional area \( A \) has a resistance \( R \). Two wires of same material,length \( L / 2 \) and cross sectional area \( 3 A \) are connected in series. The combination has resistance of a) \( R / 6 \) b) R/3 c) \( 3 R \) d) \( 6 R \)
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2 Answers 1 views
A negligbly small current is passed through a wire of length 15 cm and uniform cross-section `6.0xx10^(-7) m^(2)` and its resistance is measured to be
Correct Answer - `2xx10^(-7) Omega m`
2 Answers 1 views
A wire whose resistance is 90 ohm is cut into 3 pieces of equal lengths which are then arranged in parallel. Calculate the resistance of the combinati
Correct Answer - `10 Omega`
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A copper wire has a resistance of \( 0.60 hm \). Anozner copper wire of the samemass as the first one is dou ble in length of the first. Find the resistance of the second wire.
We know that R = ρl/A R ∝ l R1/R2 = l1/l2 Given ∵ l2 = 2l1 R1 = 0.60 hm R2/R1 = l2/l1 R2/R1 = 2l1/l1 R2 = 2 R1 R2 = 2 x 0.60 R2 = 1.2 hm
2 Answers 3 views