MHT CET 2021 21th September Evening Shift | Electrostatics Question 32 | Physics

When a piece of polythene is rubbed with wool, a negative charge of $$4 \times 10^{-7} \mathrm{C}$$ is developed on the polythene. The number of electrons transferred from wool to polythene is $$[e=1.6 \times\left.10^{-19} \mathrm{C}\right]$$

$$1.5 \times 10^{12}$$

$$3.5 \times 10^{13}$$

$$2.5 \times 10^{13}$$

$$2.5 \times 10^{12}$$

MHT CET 2021 21th September Evening Shift

MCQ (Single Correct Answer)

-0

A hollow metal sphere has a radius 'r'. The potential difference between a point on its surface and at a point at a distance '3r' from its centre is 'V'. The electric intensity at the distance '3r' from the centre of the sphere will be :

$$\mathrm{\frac{V}{3r}}$$

3Vr

$$\mathrm{\frac{V}{r}}$$

$$\mathrm{\frac{V}{6r}}$$

MHT CET 2021 21th September Morning Shift

MCQ (Single Correct Answer)

-0

'$$\mathrm{F}$$' is the force between the two identical charged particles placed at a distance '$$\mathrm{Y}$$' from each other. If the distance between the charges is reduced to half the previous distance then force between them becomes

$$\frac{F}{4}$$

$$4 \mathrm{~F}$$

$$2 \mathrm{~F}$$

$$\frac{\mathrm{F}}{2}$$

MHT CET 2021 20th September Evening Shift

MCQ (Single Correct Answer)

-0

A uniformly charged semicircular arc of radius '$$r$$' has linear charge density $$(\lambda)$$, is the electric field at its centre? ( $$\in_0=$$ permittivity of free space)

$$\frac{\lambda}{4 \epsilon_0 r}$$

$$\frac{2 \pi \epsilon_0}{\lambda}$$

$$\frac{\lambda}{4 \epsilon_0}$$

$$\frac{2 \epsilon_0}{\lambda}$$

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