Three wires whose lengths are in the ratio `3:8:18` and radii in the ratio `1:2:3` are connected in parallel. Find the ratio of the currents through them.
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Masses of 3 wires of same metal are in the ratio 1 : 2 : 3 and their lengths are in the ratio 3 : 2 : 1. The electrical resistances are in ratio
Correct Answer - 4 `rho` is same so `Rprop(l)/(A)` Now m d `rArr m=Ald` `Aprop(m)/(l) rArrR prop(l^(2))/(m)` `R_(1):R_(2):R_(3)=(9)/(1):(4)/(2):(1)/(3)=27:6:1`
2 Answers 1 views
A 10 wire potentiometer has first five wires of cross sectional radius `r` and next five wires of radius `2r`. The wires are uniform and made of same
Correct Answer - (a) 3.125 (b) 4.688 m (c) 7.5 m
2 Answers 1 views
Two infinitely long parallel wires carry current `I_(1) = 8A` and `I_(2) = 10` A in opposite directions. The separation between the wires is `d = 0.12
Correct Answer - `sqrt(40)muT`
2 Answers 1 views
Two infinitely long parallel wires carry equal current in same direction. The magnetic field at a mid point in between the two wires is
D option is correct✔
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Two long straight wires with equal cross-sectional radii a area located parallel to each other in air at large distance b from each other. Find the ca
Correct Answer - `(piepsilon_(0))/(In b//d)`
2 Answers 1 views
Two infinite long straight parallel wires A and B are separted by 0.1m distance and carry equal currents in opposite directions. A square loop of wire
Correct Answer - `2xx10^(-5) In ((4)/(3))` volt , clockwise
2 Answers 1 views
Three cells are connected in parallel with their like poles connected together with wires of negligible resistance. If the emfs of the cells are 2, 1
Correct Answer - `-(2)/(13)A,-(7)/(13)A,(8)/(13)A`
2 Answers 3 views
Two wires A and B of the same material have their lengths in the ratio `1 : 5` and diameters in the ratio ` 3 : 2`. If the resistance of the wire B is
Correct Answer - `16 Omega`
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Two wires of different materials have resistances in the ratio `4 : 3`, lengths in the ratio `2 : 1` but have same radii of cross-section. Compare the
Correct Answer - `2 : 3`
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Masses of three pieces of wires made of the same metal are in the ratio 1 : 3 : 5 and their lengths are in the ratio 5 : 3 : 1.
Correct answer is (D) 125 : 15 : 1
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