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NCERT Solutions for Class 12 Physics Chapter 1  Ray Optics And Optical InstrumentsView Solutions

NCERT Solutions for Class 12 Physics Chapter 2  Wave OpticsView Solutions

NCERT Solutions for Class 12 Physics Chapter 3  Dual Nature Of Radiation And MatterView Solutions

NCERT Solutions for Class 12 Physics Chapter 4  AtomsView Solutions

NCERT Solutions for Class 12 Physics Chapter 5  NucleiView Solutions

NCERT Solutions for Class 12 Physics Chapter 6  Semiconductor Electronics: Materials, Devices And Simple CircuitsView Solutions

NCERT Solutions for Class 12 Physics Chapter 7  Communication SystemsView Solutions
State the principal and working of a meter bridge?
Two similarly and equally charged identical metal spheres A and B repel each other with a force of 0.000002 N. A third identical sphere C is touched with A and then placed at the mid point between A nd B. What is the net electric force on C?
Q27. A wire of magnetic moment 'M' is bent to form a circular arc which subtends an angle 90° at the centre then its new magnetic moment is :
$\left(1\right)\frac{2\mathrm{M}}{\mathrm{\pi}}\left(2\right)\frac{\sqrt{2}\mathrm{M}}{\mathrm{\pi}}$
(3) $\frac{2\sqrt{2}\mathrm{M}}{\mathrm{\pi}}$ (4) $\frac{\mathrm{M}}{\sqrt{2}\mathrm{\pi}}$
On what factors the internal resistence of a cell depends ?
Three point charges of +2 microcoulomb,3 microcoulomb and 3 microcoulomb are kept at the vertices A,B and C respectively of an equilateral triangle of side 20 cm.What should be the sign and magnitude of the charge to be placed at the mid point(M) of side BC so that the charge at A remains in equilibrium?