An inclined plane making an angle of 30° with the horizontal is placed in a uniform horizontal electric field 200 N/C as shown in the figure. A body of mass 1kg and charge 5 mC is allowed to slide down from rest at a height of 1m. If the coefficient of friction is 0.2, find the time taken by the body to reach the bottom.
[g=9.8m/s2, sin 30º = 1/2 ; cos 30º = √3/2]
(1) 0.92 s
(2) 0.46 s
(3) 2.3 s
(4) 1.3 s
