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Electrostats

Solution for Class 11, Physics, Electrostats

Question 1

200.3890 An

iron

o p er a t or nam e ba r l e f t (L_{1} = 0.1 m, A_{1} i g h t .

= 0.02 m^{2}, K_{1} = 79 W m^{- 1} K^{- 1}

) and a brass bar

l e f t (L_{2} = 0.1 m . A_{2} = 0.02 m^{2} i g h t .

K_{2} = 109 W m^{- 1} K^{- 1}

) are soldered end to end as shown in Fig.

11.16

. The free ends of the iron bar and brass bar are maintained expressions for and hence compute (i) the temperature of the junction of the two bars. (ii) the equivalent thermal conductivity of the compound bar, and (iii) the heat current through the compound bar.

Topic:

Electrostats

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Question 2

NTSE - LEVEL-II PHYSICS 32. A student connects a circuit to study ohms law using a resistor of

6Ω

and a battery eliminator of

3 V

. 41 . Which of the ammeters should be chosen to read the value of current for this circuit, if the ammeters available in the laboratory have the following ranges?

$0 - 200 mA$
$0 - 3 A$
$0 - 300 A$
$0 - 1 A$

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Question 3

Q. 3.3 Two small equally charged spheres, each of mass

m

, are suspended from the same point by silk threads of length 1 . The distance between the spheres

X << 1

. Find the rate

dq / dt

with which the charge leaks off each sphere if their approach velocity varies as

v = all / x

, where

a

is a constant.

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Electrostats

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Question 4

Find Enet at point O?

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Question 5

R_{1} = 6Ω, R_{2} = 4Ω, R_{3} = 2Ω

then find current in

R_{3}

$4.5 A$
$\frac{3}{2} A$
$\frac{5}{2} A$
$\frac{4}{3} A$

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Question 6

Calculate current in

0.5Ω

$14 A$
$16 A$
$20 A$
$14.7 A$

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Electrostats

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Question 7

Two heater wires of equal length are first connected in series and then in parallel. The ratio of heat produced in the two cases is [AIIMS 2000; MPPMT 2001; CBSE 2003; BCECE 2004; BV (Pune) 2006]

$2 : 1$
$1 : 2$
$4 : 1$
$1 : 4$

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Question 8

A negative charge released from a point

A

moves along the line

A B

. The potential at

A

15 V

, and it varies uniformly along AB. The potential at B

may be $10 V$
may be $15 V$
may be $20 V$
must be $15 V$

Topic:

Electrostats

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Question 9

Find the potential difference across

20Ω

resistance in the circuit shown.

{" $15 V$ "," $7.5 V$ "," $20 V$ "," $10 V$ "}

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Electrostats

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Question 10

A butterfly is flying in a garden. First it travels due south for

6.0 m

and then

3 7^{\circ}

W of

N

for

10 m

. Assuming that the positive x-direction is east, and the positive y-direction is north, what are the coordinates of the butterflys final position relative to its initial position?

$(2, - 6)$
$(8, 0)$
$(- 6, + 2)$
$(8, - 12)$

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Electrostats

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Question 11

*83. The V-I graph for a conductor at temperatures

T_{1}

, and

T_{2}

is as shown in the figure.

l e f t (T_{2} - T_{1} i g h t)

is proportional to

$cos 2 θ$
$sin 2 θ$
$cot 2 θ$
$an 2 θ$

Topic:

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Question 12

9. Estimate the number of electrons in

100 g

of water. How much is the total negative charge on these electrons? 10. Suppose all the electrons of

100 g

water are lumped

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Question 13

Question: A neutron with a speed of

1 0^{6} m / s

suffers a head-on collision with a nucleus of mass number 80 . Calculate the fraction of energy retained by a neutron.

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Question 14

Example

2.64

Find the potential difference and charge on each capacitor.

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Question 15

heat developed in the connecting wires, Find the switch

S

is closed (

C

is the capactance of switch

S

is closed. (

C

is the capacitance of capacitor)

$C V^{2}$
$\frac{1}{8} C V^{2}$
$\frac{C V ^{2}}{2}$
$\frac{C V ^{2}}{4}$

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Electrostats

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Question 16

Two equally charged identical small balls kept some fixed distance apart exert a repulsive force F on each other. A similar uncharged ball, after touching one of them is placed at the mid-point of line joining the two balls. Force experienced by the third ball is

$4 F$
$2 F$
$F$
$\frac{F}{2}$

Topic:

Electrostats

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Question 17

7. Estimate the total number of electrons present in

100 g

of water. How much is the total negative charge carried by these electrons ? Avogadros number

= 6.02 \times 1 0^{23}

and molecular mass of water

= 18

. (Ans.

5.35 \times 1 0^{6} C

)

Topic:

Electrostats

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Question 18

38. Three identical charges, each having a value

1.0 \times 1 0^{- 8} C

, are placed at the corners of an equilateral triangle of side

20 cm

. Find the electric field and potential at the centre of the triangle.

Topic:

Electrostats

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Question 19

On incre 16. A wire of uniform cross-section

a

, length

e ll

and resistance

R

is bent into a complete circle; the resistance between any two of diametrically opposite points will be :-

$\frac{R}{2} q u a d$ (2) $\frac{R}{4}$
$\frac{R}{8}$
$4 R$
decreases

Topic:

Electrostats

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Question 20

On incre 16. A wire of uniform cross-section

a

, length

e ll

and resistance

R

is bent into a complete circle; the resistance between any two of diametrically opposite points will be :-

$\frac{R}{2} q u a d$ (2) $\frac{R}{4}$
$\frac{R}{8}$
$4 R$
decreases

Topic:

Electrostats

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Solution for Class 11, Physics, Electrostats

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