A hollow sphere which has internal and external diameter as 16 cm and 14 cm respectively is melted into a cone with a height of 16 cm. Find the diameter of the base of the cone.
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A conducting sphere of radius R is cut into two equal halves which are held pressed together by a stiff spring inside the sphere. (a) Find the change
Correct Answer - (a). `F=(Q^(2))/(32pi epsilon_(0)R^(2))` (b). `F=(piepsilon_(0)E_(0)^(2)R^(2))/(2)`
2 Answers 5 views
Watert from a tap maintained at a potential of V is alllowed to fall by drops of radius r through a small hole into a hollow conducting sphere of radi
Correct Answer - `(R^(2))/(r^(2))V`
2 Answers 1 views
If the height and radius of the cone are thriced then volume of the cone will be –
Correct answer is (D) 27 times
2 Answers 1 views
Charge of `12muC` is given toa hollow metallic sphere of radius 0.1 m. find the potential at (i) the surface of the sphere (ii) the centre of the sphe
Correct Answer - `1.08xx10^(6)V,1.08xx10^(6)V`
2 Answers 1 views
A hollow metal sphere is charged with `0.4muC` of charge and has a radius of 0.1 find the potential (i) at the surface (ii) inside the sphere (iii) at
Correct Answer - 36 kV, 3kV, 6kV
2 Answers 9 views
Consider three identical metal spheres ` A, B` and `C`. Sphere `A` carries charge ` + 6q`, sphere `B` carries charge `-3q` and sphere `C` carries no c
Correct Answer - `2.25q`
2 Answers 4 views
A glass sphere with `10 cm` radius has a `5 cm` radius spherical hole at its centre. A narraow beam of parallel light is directed into the sphere. Whe
Correct Answer - 5 cm of the left of the surface of sphere
2 Answers 1 views
A glass sphere of radius 15 cm has a small bubble 6 cm from its centre. The bubble is viewed along a diameter of the sphere from the side on which it
Correct Answer - Virtual image is seen at 7.5 cm from the spherical surface
2 Answers 2 views
The diameter of a copper sphere is 18 cm. It is melted and drawn into a long wire of uniform cross section. If the length of the wire is 108 m, find i
Correct Answer - 0.6 cm
2 Answers 1 views
A spherical cannonball 28 cm in diameter is melted and cast into a right circular cone mould, whose base is 35 cm in diameter. Find the height of the
Correct Answer - 35.84 cm
2 Answers 1 views