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State the principal and working of a meter bridge?

State the principal and working of a meter bridge?

31. Four metallic plates of equal surfae are A are arranged, as shown. The equivalent capacitance between A and B is.

$\left(\mathrm{A}\right)\frac{{\mathrm{\epsilon}}_{0}\mathrm{A}}{\mathrm{d}}\left(\mathrm{B}\right)\frac{3{\mathrm{\epsilon}}_{0}\mathrm{A}}{\mathrm{d}}\phantom{\rule{0ex}{0ex}}\left(\mathrm{C}\right)\frac{3{\mathrm{\epsilon}}_{0}\mathrm{A}}{2\mathrm{d}}\left(\mathrm{D}\right)\frac{2}{3}\frac{{\mathrm{\epsilon}}_{0}\mathrm{A}}{\mathrm{d}}$

On what factors the internal resistence of a cell depends ?

An electic dipole of length 2cm is placed with its axis making an angle 60 degree with respect to a uniform electric field of 10

^{5}N/C. If it experiences a torque of 13.856 Nm, calculate the- magnitude of the charge on the dipole & PE of the dipole.