Draw ` E-r` graph for ` 0 ltrlt b`, if two point charges a `&` b are located `r` distance apart , when
(i) both are + ve
(ii). Both are -ve
(iii). A is + ve and b is -ve
(iv) a is -ve and b is + ve

A point charge is brought in an electric field. The electric field at a nearby point (i) will increase if the charge is +ve (ii) will decrease if the charge is -ve (iii) may increase if the charge is +ve (iv) may decrease if the charge is -ve

Work done by static friction on a body in an inertial frame: (A) must be +ve (B) must be -ve(c) must be zero (D) may be-ve

Let b be a +ve integer a= b^(2) - b . b ge 4 then a^(2) -2a is divisible by

A particle performs SHM along a straight line and its position is vec(R ) , acceleration is vec(a) , velocity is vec(v) is and force on particle is vec(f) . Then which of the following statement are true? (i) vec(v). vec(a) is always + ve (ii) vec(v).vec(R ) may be -ve (iii) vec(f).vec(R ) is always -ve (iv) vec(v) is parallel to vec(f) sometimes

What type of velocit-time graph will you get, for a unitormly accelerated motion when (i) acceleration is + ve (a gt 0)and (ii) acceleration is -ve (a- lt0) ?

An object is in unifrom motion along a straight line . What will be position-time graph for themotion of the object if (a) x_(0_=+ve, v=+ ve (b) x_(0) =+ ve, v =- ve (c ) x_(0) =- ve, v= + ve and (d) both x_(0) and v are negative ? The letters x_(0) and v position of theobject at time t=0 and v represent posituion of the object at time t=0 and uniform velocity of theobject respectively.

Velocity -time graph of a particle executing SHM is as shown in fig. Select the ocrrect alternatives. (i) at position 1, displacement of particle may be +ve or-ve (ii) at position 2, displacement of particel is -ve (iii) at position 3, acceleration of particel is+v (iv) at position 4, acceleration of particle is +ve

For the charge : R to P: " "DeltaH=-ve If in above reaction , the randomnes of system increases then: