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A winding wire which is used to frame a solenoid can bear a maximum 10 A current. If the length of solenoid is 80 cm, then length of its winding wire is $(B=0.2T,r=3\times {10}^{-2}m)$

If the distance between centers of earth and moon is D and the mass of earth is 81 times the mass of moon, then at what distance from centre of earth, the gravitational force will be zero

The displacement is given by $x=2t^2+t+5$ in $\text{m}$, the acceleration at $t=5s$ will be

Match the block diagrams of blocks of mass m with their corresponding free body diagram

(Bodies are at rest w.r.t. ground)

A uniform slender bar AB of mass m is suspended as shown from a small cart of the same mass m. Neglecting the effect of friction, determine the accelerations of points A and B immediately after a horizontal force F has been applied at B

The sum of the magnitudes of two forces acting at point is $18$ and the magnitude of their resultant is $12$. If the resultant is at ${90}^{\circ }$ with the force of smaller magnitude, what are the magnitudes of forces?

The bulk modulus of rubber is $9.8\times {10}^8{\text{N/m}}^2$. To what depth a rubber ball must be taken in a lake so that its volume is decreased by $0.1\%$?
(Neglect atmospheric pressure)

Water is flowing at the rate of $500{\text{cm}}^3/\text{sec}$ in a horizontal pipe of uniform cross-section area of $25{\text{cm}}^2$. The velocity of flow of water in $\text{cm/s}$ is

Prove Galileo's law of odd numbers

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A long cylindrical tank of cross-section area 0.5$m^2$ is filled with water. It has an opening at a height 50 cm from the bottom, having area of cross-section $1\times {10}^{-4}{m}^2$ . A movable piston of cross-section area almost equal to 0.5 $m^2$ is fitted on the top of the tank such that it can slide in the tank freely. A load of 20 kg is applied on the top of the water by piston, as shown in the figure. Find the speed of the water jet with which it hits the surface when piston is 1m above the bottom (Ignore the mass of the piston).

A half disc of radius R/2 is cut out from a circular disc of radius R, such that the diameters of both discs are on same line. Find COM of remaining solid.

I want to upload figure, but my action is not completed during to some reason, which I don't know!!!!

The bulk modulus and the density of water are greater than those of air. With this much of information, we can say that velocity of sound in air

A metal wire of length $L$, area of cross-section $A$ and Young’s modulus $Y$ behaves as a spring of spring constant $K$. Which of the following is correct?

Find derivative of $f\left(x\right)=e^{\ln x}+\sin x+8$

A rain drop falls near the surface of the Earth with almost uniform velocity because

The population of a village increases at the rate proportional to the number of its inhabitants present at any time. If the population of the village was 20000 in year 1999 and 25000 in the year 2004, what will be the population of the village in 2009?

In a hydroelectric power plant, water falls at a rate of 1000 $\frac{kg}{s}$ from a height of 100m. Assuming that 50% of the energy of falling water is converted into electrical energy, calculate the power generated per second.

Find the work done by the force in the given figure?

A particle is projected at an angle with the horizontal such that it follows a trajectory given by the equation $y=6x-2x^2$. Find the maximum height attained by it.

In the figure shown, find the acceleration (in $m/s^2$) of the $2kg$ body and the tension (in $N$) in the string. (String is massless and inextensible)

According to Newton's third law each team pulls the opposite team with equal force in a game of tug of war. Why then does one team win and the other lose?

In a Young’s double slit experiment, the resultant intensity at a point on the screen with two sources with intensities 2I and 8I is 14I. calculate the phase difference between the two sources.

The emf of a storage battery is 90 V before charging and 100 V after charging by a direct current voltage supply. When charging began the current was 10 A. What is the current at the end of charging if the internal resistance of the storage battery during the whole process of charging may be taken as constant and equal to 2 ohms?

Find the tension $\left(T\right)$ shown in the string if the system is at rest. (Take $g=10{\text{m/s}}^2$)

An electron is moving in the third orbit of an atom whose radius is $r$. The de Broglie wavelength associated with electron is

A flywheel is rotating about a fixed axis passing through its COM. It has a kinetic energy of $420\text{Joules}$ when its angular speed is $20\text{rad/s}$. The moment of inertia of the wheel about the fixed axis is

One fourth length of a uniform rod of length 2l and mass m is placed on a horizontal table and the rod is held horizontal. The rod is released from rest. Find the normal reaction on the rod as soon as the rod is released

The equation of motion of a particle executing simple harmonic motion is $a+16{\pi }^{2}x=0$. In this equation, $a$ is the linear acceleration (in ${\text{m/s}}^2$) of the particle at a displacement $x$ (in meter). The time period in simple harmonic motion is

When a body is earth connected, electrons from the earth flow into the body. This means that body is...

BOOK ANSWER - Uncharged

My Answer

I know two things that electrons can be moved to:

Positively charged body

Negatively charged body (by forcing the electrons)

Neutral body

But book answer tell that body will only be Uncharged and according to me body can be charged or Uncharged.

Where I am going wrong?

A gun is aimed at a target in line of its barrel. The target is released & allowed to fall under gravity at the same instant the gun is fired. Given sufficient space, the bullets will _____.

Consider a solid hemisphere of radius R having charge Q/2. The electric potential at a point at a distance of R/2 from the centre of the sphere on the flat surface of hemisphere is

A river flows due south with a speed of 2.0 m/s. A man steers a motorboat across the river; his velocity relative to the water is 4 m/s due east. The river is 800 m wide. How much time is required to cross the river?

What are gamma rays

The resistivity of the metallic conductor is given by the relation

A gas is initially at a pressure of 100 kPa and its volume is $2.0m^3$. Its pressure is kept constant and the volume is changed from $2.0m^{3}to2.5m^3$ ,then Its volume is now kept constant and the pressure is increased from 100 kPa to 200 kPa. The gas is brought back to its initial state, the pressure varying linearly with its volume. (a) Whether the heat is supplied to or extracted from the gas in the complete cycle ? (b) How much heat was supplied or extracted ?

What is heat capacity?

A particle is projected upwards with velocity $v=30\text{m/s}$. There are two points $A$ and $B$ at heights $h_A=25\text{m}$ and $h_B=40\text{m}$. If the particle crosses point $B$ twice in a time interval $\Delta t$ then it will also cross $A$ twice in a time interval equal to $(g=10{\text{m/s}}^2)$

The north pole of a magnet is brought down along the axis of a horizontal circular coil figure. As a result, the flux through the coil changes from 0.35 weber to 0.85 weber in an interval of half a second. Find the average emf induced during this period. Is the induced current clockwise of anticlockwise as you look into the coil from the side of the magnet ?

Find the centre of mass of a rectangular lamina having sides $8\text{m}$ and $6\text{m}$ as shown in figure. [Take $\text{O}$ as origin]

From a circular disc of radius R, a square is cut out with a radius as its diagonal. The centre of mass of remainder is at a distance (from the centre)

A semiconducting material has a band gap of 1 eV. Acceptor impurities are doped into it which create acceptor levels 1 me V above the valence band. Assume that the transition from one energy level to the other is almost forbidden if kT is less than 1/50 of the energy gap. Also, if k T is more than twice the gap, the upper levels have maximum population. the temperature of the semiconductor is increased from 0 K. the concentration of the holes increases with temperature and after a certain temperature it becomes approximately constant. As the temperature is further increased, the hole concentration again starts increasing at a certain temperature. Find the order of the temperature range in which the hole concentration remains approximately constant.

The excess pressure of one soap bubble is four times more than other. Than the ratio of volume of the first bubble to another is

A ball rolls horizontally off the top of a stairway with a speed of $1.5{\text{ms}}^{-1}$. The steps are $0.2\text{m}$ high and $0.2\text{m}$ wide. If the ball hits the edge of $n^{th}$ step first, then $n$ is
(Take $g=10m/s^2$)