1
MHT CET 2021 23th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

In hydrogen atom an electron revolves around a proton (in nucleus) at a distance 'r' m. the intensity of electric field due to the proton at distance 'r' is $$5 \times 10^{11} \mathrm{NC}^{-1}$$, the magnitude of force between the electron and proton is [charge on electron $$=1.6 \times 10^{-19} \mathrm{C}$$]

A
$$4 \times 10^8 \mathrm{~N}$$
B
$$8 \times 10^8 \mathrm{~N}$$
C
$$4 \times 10^{-8} \mathrm{~N}$$
D
$$8 \times 10^{-8} \mathrm{~N}$$
2
MHT CET 2021 23th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

Two charged metallic spheres are joined by a very thin metal wire. If the radius of the larger sphere is four times that of the smaller sphere, the electric field near the larger sphere is

A
twice that near the smaller sphere
B
quarter of that near the smaller sphere
C
same as that near the smaller sphere
D
half of that near smaller sphere
3
MHT CET 2021 23th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

A charged spherical conductor has radius '$$r$$'. The potential difference between its surface and 3 point at a distance '$$3 r$$' from the centre is '$$v$$' The electric intensity at a distance '$$3 r$$' from the centre of the conductor is

A
$$\frac{v}{8 r}$$
B
$$\frac{v}{2 r}$$
C
$$\frac{v}{4 r}$$
D
$$\frac{v}{6 r}$$
4
MHT CET 2021 22th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

Two spherical conductors of radii $$4 \mathrm{~cm}$$ and $$5 \mathrm{~cm}$$ are charged to the same potential. If '$$\sigma_1$$' and '$$\sigma_2$$' be the respective values of the surface density of charge on the two conductors then the ratio $$\sigma_1: \sigma_2$$ is

A
$$5: 4$$
B
$$3: 2$$
C
$$4: 3$$
D
$$2: 1$$
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