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Physics Marks 20, , Unit Test Nod, (Electric charges and Fields) Time: 50 minutes, , pate:03/12/2021, , 1, Define electric dipole moment. Write its SI unit. (All India 2011) 2 Marks, , ».why do the electric field lines never cross each other? (All India) 2 Marks, , experienced by an electric dipole kept in a uniform electric, , 4,Derive an expression for the torque, 3 Marks:, , field. (Delhi 2017), , 4.1. Define electric flux. Write its 5. 1 unit., b. Acharge q Is enclosed by a spherical surface of radius R. If the radi, would the electric flux through the surface change? (All India 2009, , us is reduced to half, how, 2 Marks (1+1), , Given a uniform electric field B = 2% 1092" N/C, find the flux of this field through a square, of side 20cm, whose plane is parallel to the y-z plane, What would be the flux through the same, square, if the plane makes an angle of 30° with the x-axis? (Delhi 2014) 3 Mark (either (i) or (ii), , correct give 3 Marks, , 8,, , 6, a)State ‘Gauss law’ in electrostatics. b)Use this law to derive an expression for the electric field, , due, , to an infinitely long, straight wire of linear charge density > Cm" 4 Marks, , 7. Draw filed lines of a point positive chage and a point negative charge charge. 2 Marks(1+1), , sand +1 pG are separated by a distance of 2 m in air, Find the point on the, net electric field of the system is zero. (Compt. Outside Delhi, 2 Marks, , 8,Two point charges 4 pC, line-joining charges at which the, 2017) (1pC=Ipico coulomb=10%-12C)
