ThePrismSolutions

ThePrismSolutions

DAILY PRACTICE PAPER(8Th June 2018)

Q. Two identical charged spheres suspended from a common point by two massless strings of lengths l are initially a distance d (d << l) apart because of their mutual repulsion. The charge begins to leak from both the spheres at a constant rate. As a result, the charges approach each other with a velocity V. Then, as a function of distane x between them, :

(a) V ∝ x12       (b) V ∝ x    

(c) V ∝ x-12       (d) V ∝ x-1     

Q. Two point charges + 8 q and -2 q are located at x=0 and x=L respectively. The location of a point on Z-axis at which the net electric field due to these two point charges is zero:

(a)  2L      (b) L/4

(c)  8L      (d) 4L

Q. A charged oil drop is suspended in uniform field of 3x104 Vm-1 so that it niether falls nor rises. The charge on the drop will be : (take the mass of the charge 9.9x10-15kg and g= 10 ms-2)

(a)  3.3x10-18C        (b)  3.2x10-18C

(c)  1.6x10-18C        (d) 4.8x10-18C

Q. An electric dipole is placed at an angle of 30° to a non-uniform electric field. The dipole will experience :

(a) a torque as wellas translational force.
(b) a torque only.         
(c) a translational force only in the direction of the field. (d) a translational force only in a direction normal to the direction of the field.

Q. On moving a charge of 20 C by 2 cm, 2 J of work is done. Then, the potential difference between the points is :

(a) 0.1 V      (b) 8 V    

(c) 2 V         (d) 0.5 V



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