ThePrismSolutions

ThePrismSolutions

DAILY PRACTICE PAPER(7Th June 2018)

Q. If a charge q is placed at the centre of the line joining two equal charges Q such that the system is in equilibrium, then the value of q is :

(a) Q/2      (b) -Q/2

(c) Q/4      (d) -Q/4

Q. Two spherical conductors B and C having equal radii and carrying equal charges in them repel each other with a force F when kept apart at some distance. A third spherical conductor having same radius as that of B but uncharged, is brought in contact with B, then brought in contact with C and finally removed away from both. The new force of repulsion between B and C is :

(a)  F/4      (b) 3F/4

(c)  F/8      (d) 3F/8

Q. A charge Q is placed at each of the opposite corners of a square. A charge q is placed at each of the other two corners. If the net electrical force on the Q is zero, then Q/q equals

(a)  -1        (b)  1

(c)  -2√2      (d) -1/√2

Q. Four charges equal to -Q are placed at fthe four corners of a square and a charge q is at its centre. If the system is in equlibrium, the value of q is :

(a) -Q4 (1+2√2)       
(b) Q4 (1+2√2)         
(c) -Q2 (1+2√2)       
(d) Q2 (1+2√2)

Q. Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle of 30° with each other. When suspended in a liquid of density 0.8 g cm-3, the angle remains the same. If density of the material of spheres is 1.6 g cm-3, the dielectric constant of the liquid is :

(a) 1      (b) 2    

(c) 3      (d) 4



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