NEET 2020 Phase 1 | Electrostatics Question 23 | Physics

A spherical conductor of radius 10 cm has a charge of 3.2 $$ \times $$ 10^-7 C distributed uniformly. That is the magnetude of electric field at a point 15 cm from the centre of the sphere?
$$\left( {{1 \over {4\pi {\varepsilon _0}}} = 9 \times {{10}^9}N{m^2}/{c^2}} \right)$$

1.28 $$ \times $$ 10⁵ N/C

1.28 $$ \times $$ 10⁶ N/C

1.28 $$ \times $$ 10⁷ N/C

1.28 $$ \times $$ 10⁴ N/C

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

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