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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
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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