awny trom bsoth postive and negslive chage owards both posit

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Solution

2.

E = kQ/R^2

Since E is inversely proportional to square of R, So

E2/E1 = (R1/R2)^2

E2 = E1*(R1/R2)^2

E2 = E1*(r/(2r))^2 = E1/4

So (1/4) as larger

Correct option is D.

3.

E = kQ/R^2

Q = E*R^2/k

Q = 1500*0.2^2/(9*10^9)

Q = 6.67*10^-9 C

Correct option is A.

4.

F = q*E

E = F/q = 50/(2*10^-3)

E = 2.5*10^4 N/C

Since force is upward and charge is positive, So electric field will be downward

Correct option is A.