Physics Times – July 2019

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Introduction Forces in nature can be divided into two types: (i) Conservative force (ii) Nonconservative force In this article w ...

Similarly we get xz  ii F F x z       &  iii Fy Fx x y       For a given force vector F F i F j F k  x y ...

24 24 0 0 8 4 4                W WOAB OB The given force is conservative. (Method-II) The given force F Fi F j ...

    3 2 2 5/2 2 2 2 Cy x y x y x       (^)   3 2 2 5/ (2 ) 2 Cy x y x      2 2 5/ y 3 F Cxy x y x      ...

(c)y i x j^2 ˆ ˆ^2 (d) yi x jˆ ˆ^2 Verify whether the following forces are conservative or not. (1) F xyi xyj ˆ ˆ Ans : ...

ANGULAR IMPULSE Two particles of equal mass m at A and B are connected by a rigid light rod AB lying on a smooth horizontal tab ...

An impulse J is exerted on a rod of mass m and length L at a distance x from the C.M. Find the value of x at which the net velo ...

(^) Ndt mv mv  '   (i) Angular impulse by friction in the vertical direction (^22) 5 fR R Ndt mR v R         (ii ...

SECTION- Single answer type questions A thin spherical insulating shell of radius R carries a uniformly distributed charge such ...

Consider a spherical gaseous cloud of mass density ( )r in a free space where r is the radial distance from its centre. The g ...

(a) The key S 1 is kept closed for long time such that capacitors are fully charged. Now key S 2 is closed, at this time the ins ...

(c) f n f n    (d) The relation between f f  and n n  remains unchanged if both the convex surfaces are replaced by concave ...

A train S 1 , moving with a uniform velocity of 108 km/h, approaches another train S 2 standing on a platform. An observer O m ...

2.Sol: So increased by^0 V R  At t 0  1 2  dN t dt     on integrating ^12  0 loge N t N           Given th ...

3.Sol: 1 6 10 2 10 g V R R      5 10^4   RV (R Rg V) I R I I Sg g ( g) 6 3 6 2 10 10 20 10 2 10 S mA         ...

5 0 10 80 80 q q q     10 5 80 q  (^)  q 40 C ^ V across^ C 1 40 / 10 4 V Now just after closing of S 2 charge on eac ...

2 (^24) 2 cos 2 0.075 cos 60 3.75cm 1000 2 10 10 o T h rg             Case- Therefore, Option (a) is correct Case- ( ...