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Kabir Chhabra
Subject: Physics
, asked on 24/5/18
Q92
$\mathbf{92}\mathbf{.}\mathrm{The}\mathrm{electric}\mathrm{potential}\mathrm{on}\mathrm{the}\mathrm{surface}\mathrm{of}\mathrm{a}\mathrm{sphere}\mathrm{of}\mathrm{radius}\mathrm{R}\mathrm{due}\mathrm{to}a\mathrm{charge}3\times {10}^{-6}\mathrm{C}\mathrm{is}500\mathrm{V}.\mathrm{The}\mathrm{intensity}\mathrm{of}\mathrm{electric}\mathrm{field}\mathrm{on}\mathrm{the}\mathrm{surface}\mathrm{of}\mathrm{the}\mathrm{sphere}\mathrm{in}(\mathrm{N}{\mathrm{C}}^{-1})\mathrm{is}\phantom{\rule{0ex}{0ex}}\left[\frac{1}{4{\mathrm{\pi \epsilon}}_{0}}=9\times {10}^{9}\mathrm{N}{\mathrm{m}}^{2}{\mathrm{C}}^{-2}\right]\phantom{\rule{0ex}{0ex}}\left(\mathrm{a}\right)10\left(\mathrm{b}\right)20\phantom{\rule{0ex}{0ex}}\left(\mathrm{c}\right)\mathrm{between}10\mathrm{and}20\left(\mathrm{d}\right)5$
Answer
1
Kabir Chhabra
Subject: Physics
, asked on 24/5/18
Q91
Q91. Three infinitely long change sheets are placed as shown in figure. The electric field at point P is
$\left(\mathrm{a}\right)\frac{2\mathrm{\sigma}}{{\mathrm{\epsilon}}_{0}}\hat{\mathrm{k}}\left(\mathrm{b}\right)-\frac{2\mathrm{\sigma}}{{\mathrm{\epsilon}}_{0}}\hat{\mathrm{k}}\left(\mathrm{c}\right)\frac{4\mathrm{\sigma}}{{\mathrm{\epsilon}}_{0}}\hat{\mathrm{k}}\left(\mathrm{d}\right)-\frac{4\mathrm{\sigma}}{{\mathrm{\epsilon}}_{0}}\hat{\mathrm{k}}$
Answer
1
Kabir Chhabra
Subject: Physics
, asked on 24/5/18
Q.90. Four capacitors and a battery are connected as shown in the figure. If the potential difference across the 7
$\mu $
F capacitor is 6 V, then which of the following statements is incorrect?
(a) The potential drop across the 12
$\mu $
F capacitor is 10 V.
(b) The charge in the 3
$\mu $
F capacitor is 42
$\mu $
C.
(c) The potential drop across the 3
$\mu $
F capacitor is 10 V.
(d) The emf of the battery is 30 V.
Answer
1
Divya Mahesh
Subject: Physics
, asked on 24/5/18
Why in case of attraction, we take potential energy as negative and in case of repulsion we take it as positive ?
Answer
1
Aaradhya Kondawar
Subject: Physics
, asked on 23/5/18
Pls ans
Answer
1
Ranjan Shivam
Subject: Physics
, asked on 23/5/18
question 3 please explain option B,D also
Answer
2
Alfiya Chamanshaikh
Subject: Physics
, asked on 23/5/18
Solve this:
Q. A cylindrical capacitor has two co-axial cylinders of length 20 cm and radii 2r and r. Inner cylinder is given a charge 10
$\mathrm{\mu}$
C and outer cylinder a charge of -10
$\mathrm{\mu}$
C. The potential difference between the two cylinders will be
$\left(1\right)\frac{0.1\mathrm{In}2}{4{\mathrm{\pi \epsilon}}_{0}}\mathrm{mV}\left(2\right)\frac{\mathrm{In}2}{4{\mathrm{\pi \epsilon}}_{0}}\mathrm{mV}\phantom{\rule{0ex}{0ex}}\left(3\right)\frac{10\mathrm{In}2}{4{\mathrm{\pi \epsilon}}_{0}}\mathrm{mV}\left(4\right)\frac{0.01\mathrm{In}2}{4{\mathrm{\pi \epsilon}}_{0}}\mathrm{mV}$
Answer
1
Adarsh .a
Subject: Physics
, asked on 23/5/18
Give some applications of Gauss law?
Answer
1
Sudhanshu Singh
Subject: Physics
, asked on 23/5/18
Q.4. Find equivalent resistance between terminals A and D in following circuit.
Answer
2
Vani Singh
Subject: Physics
, asked on 23/5/18
Question 10 please
Q.10.
Eight point charges are located at the corners of a cube of side a as shown in fig. Find the work done to separate the charges to infinite distance.
$[5.8\frac{k{q}^{2}}{a}]$
Answer
1
Vani Singh
Subject: Physics
, asked on 23/5/18
Ques 4 plss
Answer
1
Queens Land
Subject: Physics
, asked on 23/5/18
Solve this:
Q. Two charges + 6
$\mu $
C and - 4
$\mu $
C are placed 15 cm apart as shown. At what distance from A to its right, the electrostatic potential is zero (distance in cm)
(1) 4, 9, 60
(2) 9, 45, infinity
(3) 20, 45, infinity
(4) 9, 15, 45
Answer
1
Queens Land
Subject: Physics
, asked on 23/5/18
Solve this:
Q. 27 identical drops of mercury are charged simultaneously with same potential of 10 volt. Assuming the drop to be spherical, if all the charged drops are made to combine to form one large drop, then its potential will be (in volts)
(1) 90
(2) 40
(3) 160
(4) 10
Answer
1
Queens Land
Subject: Physics
, asked on 23/5/18
Q). Two charged spheres of radii
${R}_{1}$
and
${R}_{2}$
having equal surface charge density. The ratio of their potential is
(1)
${R}_{1}$
/
${R}_{2}$
(2)
${R}_{2}$
/
${R}_{1}$
(3)
${\left({R}_{1}/{R}_{2}\right)}^{2}$
(4)
${\left({R}_{2}/{R}_{1}\right)}^{2}$
Answer
1
Queens Land
Subject: Physics
, asked on 23/5/18
Solve this:
Q. Consider a sphere of radius R having charge q uniformly distributed inside it. At what minimum distance from its surface the electric potential is half of the electric potential at its centre?
$\left(1\right)\mathrm{R}\left(2\right)\frac{\mathrm{R}}{2}\phantom{\rule{0ex}{0ex}}\left(3\right)\frac{4\mathrm{R}}{3}\left(4\right)\frac{\mathrm{R}}{3}$
Answer
1
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$\mathbf{92}\mathbf{.}\mathrm{The}\mathrm{electric}\mathrm{potential}\mathrm{on}\mathrm{the}\mathrm{surface}\mathrm{of}\mathrm{a}\mathrm{sphere}\mathrm{of}\mathrm{radius}\mathrm{R}\mathrm{due}\mathrm{to}a\mathrm{charge}3\times {10}^{-6}\mathrm{C}\mathrm{is}500\mathrm{V}.\mathrm{The}\mathrm{intensity}\mathrm{of}\mathrm{electric}\mathrm{field}\mathrm{on}\mathrm{the}\mathrm{surface}\mathrm{of}\mathrm{the}\mathrm{sphere}\mathrm{in}(\mathrm{N}{\mathrm{C}}^{-1})\mathrm{is}\phantom{\rule{0ex}{0ex}}\left[\frac{1}{4{\mathrm{\pi \epsilon}}_{0}}=9\times {10}^{9}\mathrm{N}{\mathrm{m}}^{2}{\mathrm{C}}^{-2}\right]\phantom{\rule{0ex}{0ex}}\left(\mathrm{a}\right)10\left(\mathrm{b}\right)20\phantom{\rule{0ex}{0ex}}\left(\mathrm{c}\right)\mathrm{between}10\mathrm{and}20\left(\mathrm{d}\right)5$

Q91. Three infinitely long change sheets are placed as shown in figure. The electric field at point P is

$\left(\mathrm{a}\right)\frac{2\mathrm{\sigma}}{{\mathrm{\epsilon}}_{0}}\hat{\mathrm{k}}\left(\mathrm{b}\right)-\frac{2\mathrm{\sigma}}{{\mathrm{\epsilon}}_{0}}\hat{\mathrm{k}}\left(\mathrm{c}\right)\frac{4\mathrm{\sigma}}{{\mathrm{\epsilon}}_{0}}\hat{\mathrm{k}}\left(\mathrm{d}\right)-\frac{4\mathrm{\sigma}}{{\mathrm{\epsilon}}_{0}}\hat{\mathrm{k}}$

(a) The potential drop across the 12 $\mu $F capacitor is 10 V.

(b) The charge in the 3 $\mu $F capacitor is 42 $\mu $C.

(c) The potential drop across the 3 $\mu $F capacitor is 10 V.

(d) The emf of the battery is 30 V.

Q. A cylindrical capacitor has two co-axial cylinders of length 20 cm and radii 2r and r. Inner cylinder is given a charge 10 $\mathrm{\mu}$C and outer cylinder a charge of -10 $\mathrm{\mu}$C. The potential difference between the two cylinders will be

$\left(1\right)\frac{0.1\mathrm{In}2}{4{\mathrm{\pi \epsilon}}_{0}}\mathrm{mV}\left(2\right)\frac{\mathrm{In}2}{4{\mathrm{\pi \epsilon}}_{0}}\mathrm{mV}\phantom{\rule{0ex}{0ex}}\left(3\right)\frac{10\mathrm{In}2}{4{\mathrm{\pi \epsilon}}_{0}}\mathrm{mV}\left(4\right)\frac{0.01\mathrm{In}2}{4{\mathrm{\pi \epsilon}}_{0}}\mathrm{mV}$

Q.10.Eight point charges are located at the corners of a cube of side a as shown in fig. Find the work done to separate the charges to infinite distance. $[5.8\frac{k{q}^{2}}{a}]$Q. Two charges + 6 $\mu $C and - 4$\mu $C are placed 15 cm apart as shown. At what distance from A to its right, the electrostatic potential is zero (distance in cm)

(1) 4, 9, 60

(2) 9, 45, infinity

(3) 20, 45, infinity

(4) 9, 15, 45

Q. 27 identical drops of mercury are charged simultaneously with same potential of 10 volt. Assuming the drop to be spherical, if all the charged drops are made to combine to form one large drop, then its potential will be (in volts)

(1) 90

(2) 40

(3) 160

(4) 10

(1) ${R}_{1}$/${R}_{2}$

(2) ${R}_{2}$/${R}_{1}$

(3) ${\left({R}_{1}/{R}_{2}\right)}^{2}$

(4) ${\left({R}_{2}/{R}_{1}\right)}^{2}$

Q. Consider a sphere of radius R having charge q uniformly distributed inside it. At what minimum distance from its surface the electric potential is half of the electric potential at its centre?

$\left(1\right)\mathrm{R}\left(2\right)\frac{\mathrm{R}}{2}\phantom{\rule{0ex}{0ex}}\left(3\right)\frac{4\mathrm{R}}{3}\left(4\right)\frac{\mathrm{R}}{3}$