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School of Modern School Name: Date : Revision sheet-I&II Subject: Physics Grade :11 MULTIPLE CHOISE 1. The electric field at the location of q' is represented by Equations as E=_________________________. 2. As per Coulomb's Law, _________________ between two point charges is 1/(distance)2 3. An electric force F exists between two objects, both having the charge q. If the charge on one object is doubled to 2q, the force between the objects becomes ______________F. 4. An electric force F exists between two objects separated from each other by distance r. If the distance is decreased to 0.5r, the force between the two objects becomes _______________F. 5. Two point charges, initially 2 cm apart, are moved to a distance of 8 cm apart. The resulting electric force between them change by a factor of____________________. 6. Two charged objects are near each other. One has a charge of +1.0× 10-5 C and the other has a charge of +2× 10-5 C. If the first charge doubles to +2× 10-5 C, and the second charge doubles to +4× 10-5 C the force between the charges changes by a factor of _______________ 7. Electric force and gravitational force are alike in that both ___________________ forces 8. The diagram below represents an array of point charges of the magnitudes shown. Assume that no net force acts on charge q3. The sign of q3 will be_____________ and magnitude of charge q3 will be______________________________. 1 School of Modern School Name: Date : Revision sheet-I&II 1m q1 -6×10-9C Subject: Physics Grade :11 1m q3 q2 -6×10-9C ? 9. Gravitational force is ______________ than electric force between two charges. 10.SI unit of charge is___________________. 11. SI unit of force is ____________________. 12.The electric force between two charges acts along a _____________ that connects their centers of charges. 13. Electric field strength depends on________________ and ___________. 14. when two charges are moved closer together ,the electric field becomes_______________. 15.Resultant force on a charge is the _____sum of individual forces on that charge. 16. The SI unit of electric field strength is________________. 17. A region where an electric force on a test charge can be detected is called_________. 18. The SI unit of electric field strength is________________. 1 School of Modern School Name: Date : Revision sheet-I&II Subject: Physics Grade :11 SECTION B Answer any five questions. i. What is formulae of Elecrtic force and gravitational force? _____________________________________________ ______________________________________________ iiRelate the formula of electric field strength (E=Felectric/q0) with Coulomb’s law. ______________________________________________ iii. Define the equilibrium position of a charge under the influence of another two charges in electrostatics? ___________________________________________________ ___________________________________________________ ___________________________________________________ __________________________________________________ 1 School of Modern School Name: Date : Revision sheet-I&II Subject: Physics Grade :11 iv.Define Coulomb’s law. __________________________________________________ ___________________________________________________ v.Define electric field. SECTION C Solve problems. 1. A +5.0 µC charge and a -6.0 µC charge experience an attractive force of -0.72 N ("-" means attractive). Determine their separation distance. 2. Kalyan Ramji Sain, of india, had a mustache that measured 3.39m from end to end in 1993. Suppose two charges ,q and 3q, are placed 3.39m apart.If the magnitude o the electric force between the charges is 2.4×10-6N, what is the valueof q? 1 School of Modern School Name: Date : Revision sheet-I&II Subject: Physics Grade :11 ] 4. A charge , q1= 7.00×10_6 C, is at the origin, and a second charge,q2= _5.00×10_6 C is on the x_axis 0.300 m from the origin.Find the electric field strength at a point P on the y_axis 0.400m from the origin. Diagram. E1 P r1=0.400m 90° q1 + Θ=53.1° E2 r2=0.500m q2 - Solution: 0.300m Step-1.Determine the size of the charges 1 School of Modern School Name: Date : Revision sheet-I&II Subject: Physics Grade :11 Step-2. Calculate the electric field strength E1 , E2 produced by each charge by using formula: E=kcq/r2 Step-3. Find the x and y component of E1 and E2 x-component of E1=Ex,1 y-component of E1= Ey,1 Ex,1= E1 cosθ ; Ey,1= E1 sinθ x-component of E2= Ey,2 =Ey,1 y-component of E2 Step-4. Calculate the the total electric field strength in both directions Ex,tot Ey,tot 1 School of Modern School Name: Date : Revision sheet-I&II Step-5. Ca1culate Etot=√(Ex,tot)2+(Ey,tot)2 Step-5 calculate Tanθ= Ey,tot/Ex,tot 1 Subject: Physics Grade :11