Question

The block shown in the diagram has a mass of
2 microgram and a charge of 2 × 10^–9 coulomb. If the block is given an initial velocity of 2m/s in x direction at t = 0 moment and an electric field of 2N/C in x direction is switch on at that moment then R will be (g = 10 m/s²)-

• A. 4m
• B. 1m
• C. 2m
• D. 3m

Answer 1

Answer: (D)

3m

Answer 2

s_x = u_xt + $\frac { 1 } { 2 }$ a_xt² …(1) s_y = u_yt +$\frac { 1 } { 2 }$ a_y t²…(2)

R = 2 × t + $\frac { 1 } { 2 }$ 5 = 0 + $\frac { 1 } { 2 }$ × g × t²

R = 2 × 1 + $\frac { 1 } { 2 }$× $\frac { 2 \times 10 ^ { - 9 } \times 2 } { 2 \times 10 ^ { - 9 } } \times 1$ t =

= 2 + 1 = 3m