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Unit of Vector area element is
1. m2
2. V m–1
3. V m
4. V c
Like charges
1. repel each other
2. attract each other
3. bond each other
4. none of these
Which forces determine the properties of atoms, molecules and bulk matter.
1. field
2. magnetic
3. electric
4. none of these
What allow movement of electric charge through them
1. insulators
2. semi insulators
3. conductors
4. none of these
What of electric charge means that total charge of a body is always an integral multiple of a basic quantum of charge
1. Quantization
2. additivity
3. conservation
4. none of these
What of electric charge means that the total charge of a system is the algebraic sum of all individual charges in the system.
1. conservation
2. quantization
3. additivity
4. all of these
What of electric charges means that the total charge of an isolated system remains unchanged with time
1. additivity
2. conservation
3. quantization
4. none of these
This law states that the mutual electrostatic force between two point charges is proportional to the product of the charges and inversely proportional to the square of the distance separating them
1. magnetic law
2. coulomb's law
3. electric force
4. none of these
The flux of electric field through any closed surface S is 1/ε0 times the total charge enclosed by S. ia called
1. magnetic law
2. gauss's law
3. coulomb's law
4. none of these
The Gaussian surface for calculating the electric field due to a charge distribution is
1. Any closed surface around the charge distribution
2. Any surface near the charge distribution
3. A spherical surface
4. A symmetrical closed surface at every point of which electric field has a single fixed value.
How many electrons are there in ‒1 coulomb?
1. 6.25 × 1018
2. 62.5 × 1018
3. 6.023 × 1023
4. 1.6 × 10-19
The S.I. unit for surface integral of electric field is:
1. V/m
2. V
3. NC-1m
4. Cm-3
The value of charge q at the centre of two equal and like charges Q so that the three are in equilibrium is:
1. Q/2
2. -Q/2
3. -Q/4
4. Q
When an electric dipole is placed in a uniform electric field, it experiences
1. Force as well as torque
2. Torque but no net force
3. Force but no torque
4. Neither any force nor any torque
VAand VBare two points on a curved equipotential surface then,
1. VA> VB
2. VA< VB
3. VA= VB
4. Relation between the two can’t be predicted
Electric filed is zero in case of a charged conducting shell at any:
1. interior point
2. outer point
3. beyond 2 meters
4. none of these
which force acts along the line joining the two charges. It obeys Newton's third law of motion
1. electric force
2. electrostatic force
3. magnetic force
4. none of these
A charge of magnitude q is divided into two parts such that force between resulting two charges is maximum when separated through some distance r. The division of charges would bE
1. 3q/8 , 5q/8
2. 2q/4 , 2q/4
3. q/2 , q/2
4. 3q/6 , 3q/6
Four charges q, 2q, 3q, 4q are placed at corners A, B, C and D of a square as shown below in the figure. The field at centre O of square has the direction along
1. AB
2. CB
3. AC
4. DB
Twelve charges of charge q are situated at the corners of the 12 sided polygon of side a. What is the net force on the charge Q at the centre
1. ZERO
2. 3qQ/πε0a2
3. qQ/πε0a2
4. NONE OF THESE
Two positive point charge are placed at the distance a apart have sum Q. What values of the charges , coulomb force between them is maximum
1. q1=q1=Q/2
2. q1=3Q/4 ,q2=Q/4
3. q1=5Q/6 ,q2=Q/6
4. NONE OF THESE
A metallic shell having inner radius R1 and outer radii R2 has a point charge Q kept inside the cavity. Electric field in the region R1 < r < R2 where r is the distance from the centre is given by
1. depends on the value of r
2. zero
3. Constant and nonzero everywhere
4. none of these
A metallic solid sphere of radius R is given the charge Q. Which of the following statement is true then
1. Electric field at points 0< r < R is zero
2. Charge Q is on the outer surface of the sphere
3. Electric field at r>R is given by Q/4πε0r2
4. all the above
At a point on the axis of an electric dipole
1. electric field is zero
2. Electric potential is zero
3. Neither electric field nor electric potential is zero
4. Electric field is directed perpendicular to axis
A point charge (Q) is located at the centre of a cube of edge length a, find the final electric flux over one face of the cube
1. Q/ε0
2. Q/6ε0
3. 6Q/ε0
4. none of the above
Find the electric field inside the sphere which carries a charge density proportional to the distance from the origin
ρ = kr
1. ρ/ε0
2. ρr/ε0
3. ρr2/ε
4. none of the above
A uniform line charge with linear density λ lies along the y-axis. What flux crosses a spherical surface cantered at the origin with r = R
1. 2Rλ/ε0
2. Rλ/ε0
3. λ/ε0
4. nonw of these
electric point at a point varies as r degree
1. an electric dipole
2. a point charge
3. a plane infinite sheet of charge
4. none of these
S.I. unit of electric field intensity is
1. N*C
2. N/C
3. N-C
4. N+C
S.I. unit of permitivity of free space is:
1. farad
2. weber
3. C2N-1m-2
4. none of the above

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