Electric Charges and Fields Test

Result

Electric Charges and Fields Test - 81

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Weekly Quiz Competition

Question 1
1 / -0

A hollow conducting sphere has inner radii $$5\ cm$$ and outer radius $$8\ cm$$ then find maximum possible potential of conductor if breakdown electric field of air is $$3 \times 10^6 V/m$$

A
$$240\ kV$$

B
$$480\ kV$$

C
$$960\ kV$$

D
$$720\ kV$$

Solution
Question 2
1 / -0

Two particle of equal mass $$m$$ and charge $$q$$ are placed at a distance of $$16$$ cm. They do not experience any force. The value of $$\dfrac { q }{ m } $$ is

A
$$4\pi \epsilon _{ 0 }G$$

B
$$\sqrt { \dfrac { { \pi \epsilon }_{ 0 } }{ G } } $$

C
$$\sqrt { \dfrac { G }{ 4\pi \epsilon _{ 0 } } } $$

D
$$\sqrt { 4\pi \epsilon _{ 0 }G } $$

Solution
Question 3
1 / -0

Two charge particles $$+3 \mu C$$ and $$-2 \mu C$$ are placed 2 m apart. Half of the region between them is filled with a medium having relative permttivity 9. Find the electric force between two charges.

A
$$60 \times 10^{-3} N$$

B
$$3.37 \times 10^{-3} N$$

C
$$8 \times 10^{-3} N$$

D
$$13.5 \times 10^{-3} N$$

Solution
Question 4
1 / -0

A charge Q is divide in two parts $$ Q_1 $$ and $$ Q_2 $$ and these charges are placed at a distance R. there will be maximum repulsion between them when.

A
$$ Q_1 = Q - q ; Q_2 = q $$

B
$$ Q_{ 1 }\frac { 2Q }{ 3 } ,Q_{ 2 }=\frac { Q }{ 3 } $$

C
$$ Q_{ 1 }\frac { 3Q }{ 4 } ,Q_{ 2 }=\frac { Q }{ 4 } $$

D
$$ Q_{ 1 }=Q_{ 2 }=\frac { Q }{ 2 } $$

Solution
Question 5
1 / -0

A metallic ring is inserted through a sot iron cylinder which is wound with a copper wire and fixed to the wooden base as shown in the diagram when we flow A.C current through the copper wire then metal ring is leviated on the coil because,
Choose the correct option from above and give explanation

A
The metal ring availed sufficient lifting force equal to its weight by getting repelled by the coil continuously.

B
the metal ring behaved like a magnet by varying its polarities opposites to that of coil in the same time intervals.

C
the metal ring is induced with an alternating current by which it opposed the variation of polarities produced in the coil

D
the variation of flux produced by the coil has induced some alternating current in the metal ring.

Solution
Question 6
1 / -0

An infinite number of electric charges, each of magnitude $$1 \mu C$$, are placed on the x-axis with coordinates $$x=1,2,4,8...\infty$$ , If charge of 1 $$C$$ is kept at the origin. Calculate the net force acting on this charge.

A
$$13000N$$

B
$$12000N$$

C
$$11000N$$

D
$$14000N$$

Solution
Question 7
1 / -0

The smiling face in figure consists of three items (a), A thin rod of charge $$-3.0\ \mu C$$ that forms a full a form circle of rading $$6\ cm$$.
(b) second thin rod of charge $$2.0\ \mu C$$ that forms a circular are of radius $$4.0\ cm$$. Subtending an angle of $$20^\circ$$ about the centre of the full circle and
(c) Electric dipole with a dipole moment that is $$\perp$$ to a radial line and has a magnitude $$1.28 \times 10^{-21}\ cm$$, what is the net electric potential of the centre.

A
Zero

B
$$2.3 \times 10^{-3}$$

C
$$1.28 \times 10^{21}$$

D
None of these

Solution
Question 8
1 / -0

Electric force between two charged sphere is $$18$$ units. If the distance between the centres of the sphere sphere is tripled , the electric field will be

A
$$6$$units

B
$$2$$units

C
$$3$$units

D
$$54$$units

Solution
Question 9
1 / -0

$$U ( x ) = \frac { c } { x ^ { 9 } } - \frac { d } { x }$$ ; where $$c$$ and $$d$$ are positive constants and $$x$$ is the distance between the atoms
Find the force $$F(x)$$ between the atoms.

A
$$\dfrac { d x ^ { 8 } - 9 c } { x ^ { 10 } }$$

B
$$\dfrac { - 9 c } { x ^ { 10 } }$$

C
$$\dfrac { 9 c - d x ^ { 8 } } { x ^ { 10 } }$$

D
$$\dfrac { 9 c - d x ^ { 6 } } { x ^ { 8 } }$$

Solution
Question 10
1 / -0

Two charges placed in air at a distance 1 m exert force.'F' on each other. If these charges placed inside mica at same distance, then the new force between charges is

A
$$>F$$

B
$$ < F$$

C
$$=F$$

D
Depends on area of slab

Solution