Electric Charges and Fields

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Explanation-The electric lines of forces always starts from a positive charge and   ends at a negative charge. In case of a single isolated charge, electric lines of force start from positive charge ends at infinity.

(i)

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Answer = $\frac{d}{2}$ (1+ $\sqrt[]{3}$ ) towards left.

Explanation -lets consider 2q charge is placed in between q and -3q, here it will definitely experience some force q charge repel 2q charge and -3q charge will attract 2q charge. So 2q charge will m

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Explanation- (i)The cesium atoms, are situated at the corners of a cube and Cl atom is situated at the centre of the cube. From the given figure, we can analyse that the chlorine atom is at equal distance from all the eight comers

Explanation- (i) F= $\frac{Kq2}{r2}$ = 9 $\times$ 10^{9 $\times$} (34.8 $\times$ 10³)²/ (10^-2)²=1.09 $\times$ 10²³N

                      (ii) F= $\frac{Kq2}{r2}$ = 9 $\times$ 10^{9 $\times$} (34.8 $\times$ 10³)²/ (100)²=1.09 $\times$ 10¹⁵N

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Explanation- 1 molar mass of Al has N_A (Avogadro number)= 6.023 $*$ 10²³

M= $\frac{NA}{M}*$ m= 6.023 $*$ 10²³/27 $*$ 0.75 = 1.6 $*$ 10²²

Magnitude of positive and negative charges in one paisa coin = Nze

As aluminium has 13 electron and 13 protons so

=  1.

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Explanation – in these type of question imagine another cube along the charge is kept in 3 dimensional aspects.

• In this part the charge is situated at the corner of cube here we can placed 7 more cube joining the corner of that cube

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Explanation- No field inside a hollow body because if we give charge to a hollow body whole charge is distributed outside its surface. This phenomenon is called electrostatic shielding which is used to protect things from electric

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Explanation- if the total charge inside a surface is zero it does not mean that electric field is zero may it will flow from inside to outside or vice versa. But if electric field is zero then charge must be zero .

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Explanation- In any neutral atom, the number of electrons and protons are equal, and the protons and electrons are bound into an atom with distinct and independent existence. Electrostatic fields are caused by the presence of

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Explanation – (i) surface density=charge/area= -Q/4 $\pi R$ ₁²

                        (ii) surface density=charge/area= +Q/4 $\pi R$ ₂²