NEET 2019 | Electrostatics Question 25 | Physics

NEET 2019

MCQ (Single Correct Answer)

-1

A hollow metal sphere of radius R is uniformly charged. The electric field due to the sphere at a distance r from the centre :

zero as r increases for r < R, decreases as r increases for r > R

zero as r increases for r < R, increases as r increases for r > R.

decreases as r increases for r < R and for r > R.

increases as r increases for r < R and for r > R.

NEET 2019

MCQ (Single Correct Answer)

-1

Two point charges A and B, having charges +Q and – Q respectively, are placed at certain distance apart and force acting between them is F. If 25% charge of A is transferred to B, then force between the charges becomes :

$${{16F} \over 9}$$

$${{9F} \over {16}}$$

$${{4F} \over 3}$$

NEET 2019

MCQ (Single Correct Answer)

-1

Two parallel infinite line charges with linear charge densities +$$\lambda $$ C/m and -$$\lambda $$ C/m are placed at a distance of 2R in free space. What is the electric field mid-way between the two line charges?

$${{2\lambda } \over {\pi {\varepsilon _0}R}}$$ N/C

zero

$${\lambda \over {\pi {\varepsilon _0}R}}$$ N/C

$${\lambda \over {2\pi {\varepsilon _0}R}}$$ N/C

NEET 2018

MCQ (Single Correct Answer)

-1

A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform electric field $$\overrightarrow E $$ . Due to the force q$$\overrightarrow E $$ , its velocity increases from 0 to 6 m s^–1 in one second duration. At that instant the direction of the field is reversed. The car continues to move for two more seconds under the influence of this field. The average velocity and the average speed of the toy car between 0 to 3 seconds are respectively

2 m s^–1, 4 m s^–1

1 m s^–1, 3 m s^–1

1 m s^–1, 3.5 m s^–1

1.5 m s^–1, 3 m s^–1

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