Electric charges and fields-test
Electric Charges and Fields Quiz
Test your understanding of electric charges and fields with our comprehensive quiz! This quiz covers a range of topics related to electric fields, dipoles, and the forces between charged particles.
Prepare to challenge yourself with questions that include:
- Conceptual understanding of electric fields
- Interactions between charged objects
- Calculations involving dipole moments
A few electric field lines for a system of two charges Q1 and Q2 fixed at two different points on the x-axis shown in the figure. These lines suggest that:-
(a) Magnitude of Q1 is greater than Q2.
(b) Magnitude of Q1 is less than Q2.
(c) At a finite distance to the left of Q1 the electric field is zero.
NONE
Two identical spheres with charges 4q & -2q kept some distance apart exert a force F on each other, if they are made to touch each other and replaced at their old positions, the force between them will be:-
F/9
F/8
9F/8
8F/9
Consider the following statements. I. When we produce charge q1 on a body by rubbing it against another body which gets a charge q2 in the process, then q1 + q2 = 0. II. II.Charge on an isolated system remains constant. Choose the correct option.
Both I & II are correct
Only I is correct
Only II is correct
Both I and II are incorrect
The value of electric field at the center of a dipole will be
Zero
Equal to electric field due to single charge
Twice the electric field due to single charge
Half the electric field due to single charge
The dot product of torque acting on a dipole and electric dipole moment is always equal to
Electric field
Square of electric field
Can not be determined
Zero
Two small identical dipoles AB and CD, each of dipole moment p are kept at an angle of 120° as shown in the figure. What is the resultant dipole moment of this combination? If this system is subjected to electric field E directed along + X direction, what will be the magnitude of torque acting on this?
PE
PE/2
2pE
ˆš2pE
In general metallic ropes are suspended on the carriers taking inflammable materials. The reason is:-
(a) To control the speed of the carrier
(b) To keep the centre of gravity of the carrier near to the earth.
(c) To keep the body of the carrier in contact with the earth.
(d) None of these
Find the correct match of A,B,C,D
2,3,4,1
3,2,1,4
4,1,3,2
1,4,2,3
Four equal charge q are placed at the four corners A,B,C,D of a square of length a. The magnitude of the force at B will be:-
C3q2/a2
C4q2/a2
C(1 + 2√2) q2/2a2
C(√2+1)q2/4a2
6. Three charges are placed at the vertices of an equilateral triangle of side ‘a’ as shown in the following figure. The force experienced by the charge placed at the vertex A in a direction normal to BC is:-
Q2/4πɛ0a2
- Q2/4πɛ0a2
Zero
Q2/2πɛ0a2
Three charges –q1, +q2 and –q3 are placed as shown in the figure. The x-component of force on – q1 is proportional to:-
Q2/b2 + q3 cos θ/a2
Q2/b2 - q3 sin θ/a2
Q2/b2 - q3 cos θ/a2
Q2/b2 + q3 sin θ/a2
`
A certain charge Q is divided into two parts q and q' . Later on the charges are placed at a certain distance. If the force of attraction between the charges is maximum,then
Q/q'=2
Q/q'=1
Q/q'=4
Q/q'=3
The work done in rotating a dipole to 180 from the direction of electric field is
PE
2pE
PE/2
Zero
When a dipole is placed in anon-uniform electric filed
A net force acts on it but the net torque is zero
Net torque acts on it but the net force is zero
Both net force and torque acts on it
None of the above
At the center of a dipole the angle between net electric field and electric dipole moment is
0
90
180
120
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