Find the self inductance of a unit length of a cable consisting of two thin walled coaxial metallic cylinders if the radius of the outside cylinder is `eta (eta gt 1)` times that of the inside one. The permeability of the medium between the cylinders is assumed to be equal to unity.
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A wire of fixed length is wound on a solenoid of length `l` and radius `r`. Its self-inductance is found to be `L`. Now, if the same wire is wound on
Correct Answer - A `L=(mu_(0)N^(2)pir^(2))/l` length of wire =`N 2pir`=Constant(=`C`suppose) `therefore L=mu_(0)(C/(2pir))^(2) (pi r^(2))/l therefore L prop 1/l` `therefore` Self inductance will become `2L`.
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Define self -inductance and its `S.I.` unit. Derive an expression for self- industance of a long, air-cored solenoid of length , radius `r`, and havin
The self inductance of a coil is equal to the induced `emf` set up in the coil, when the current passing through it change at the unit rate The `SI`...
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A narrow layer of thin-walled cells found between phloem/bark and wood of a dicot is
Correct Answer - b Vascular cambium is formed by strips of fascicular cambium and interfascicular cambium. It consist of narrow layer of thin walled cells found between phloem and xylem tissues....
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A long cylindrical conductor of radius a contains a long cylindrical holr of radius l. The axes of the two cylinders are parallel and are at a distanc
Correct Answer - `(mu_(0)id)/(2pi(a^(2)-b^(2))`
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Calculate the capacitance per metre of a capacitor formed by two long coaxial cylinders of radii 5 and 5.2 cm filled with dielectric of permittivity 1
Correct Answer - `1.7xx10^(-9)F`
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A submarine cable consisting of a wire 3 mm in diameter and insulated with 3 mm of guttapercha (permittivity=4.26) is placed in water. Calculate the c
Correct Answer - `0.215muF`
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Find the capacitance of a system consisting of a metal sphere of radius a placed at a large distance from an identical metallic sphere. [Hint: When th
Correct Answer - `2piepsilon_(0)epsilon_(r)a`
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A long coaxial cable consists of two concentric cylinders of radii a and b. The central conductor of the cable carries a steady current I and the oute
Correct Answer - `(mu_(0)i^(2)l)/(4pi)In((b)/(a))`
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A cylindrical capacitor is constructed using two coaxial cylinders of the same length 10cm of redii 2mm and for mm. (a) calculate the capacitance (b)
Correct Answer - 8pF
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A parallel beam of rays is incident on a consisting pf three thin lenses with a common optical axis. The focal length of the lenses are equal to `f_1=
Correct Answer - Infinity
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