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Ta identical loopsnone of copper and other of constanton are removed from a magnetic field within same time interview. In which loop induced current will be greater?

A transistor has a base current of $1\text{mA}$ and emitter current $100\text{mA}$. The current transfer ratio will be

A horizontal force just sufficient to move a body of mass $4\text{kg}$ lying on a rough horizontal surface is applied on it. The coefficient of static and kinetic friction between the body and the surface are $0.8$ and $0.6$, respectively. If the force continues to act even after the block has started moving, the acceleration of the block in ${\text{ms}}^{-2}$ is $(g=10{\text{ms}}^{-2})$

A mixture of gases contains $H_2\left(g\right)$ and $O_2\left(g\right)$ in the ratio of $1:4\left(w/w\right)$. What is the molar ratio of the two gases in the mixture?

Point P is $\overrightarrow{r}$ away from O and a force $\overrightarrow{F}$ is applied at P as shown.

What can be said about $\overrightarrow{T}$ of $\overrightarrow{F}$ about O ?

RMS current of the given saw tooth A.C current is

Twenty seven drops of the same size are charged to a potential of $220\text{V}$ each. They combine to form a bigger drop. The potential of the bigger drop is-

In the figure below, a block of weight 60 N is placed on a rough surface. The coefficient of friction between the block and the surface is 0.5. What should be the weight W such that
the block does not slip on the surface?

Three-point charges q, - 4q, and 2q are placed at the vertices of an equilateral triangle ABC of side 'l' as shown in the figure.

(a)Obtain the expression for the magnitude of the resultant electric force acting on the charge q.

(b) Find out the amount of work done to separate the charges at an infinite distance.

Two thermometers X and Y have ice points marked at ${15}^{\circ }$ and ${25}^{\circ }$ and steam points marked as ${75}^{\circ }$ and ${125}^{\circ }$ respectively. When thermometer X measures the temperature of a bath as ${60}^{\circ }$ on it, what would thermometer Y read when it is used to measure the temperature of the same bath?

Calculate the steady state current in the $2\Omega$ resistor and steady state charge on the capacitor in the circuit?

Three capacitors of capacitance $3\mu \text{F},10\mu \text{F}$ and $15\mu \text{F}$ are connected in series to a battery of $100\text{V}$. The charge on $15\mu \text{F}$ is

If at same temperature and pressure, the densities for two diatomic gases are $d_{1}and{d}_2$ respectively, then the ratio of velocities of sound in these gases will be

A block at rest is released from a smooth inclined plane of inclination ${45}^{\circ }$ and is allowed to slide a distance 'd'. Now same block is released on a similar rough inclined plane and allowed to slide the same distance. The time taken by block to slide on rough plane is 'n' times the time taken by it on a smooth plane. Then what would be the coefficient of friction for the rough inclined plane?

Three capacitors of capacitance $3\mu \text{F},10\mu \text{F}$ and $15\mu \text{F}$ are connected in series to a battery of $100\text{V}$. The ratio of voltage across $10\mu \text{F}$ and $15\mu \text{F}$ is

Consider two waves passing through the same string. Principle of superposition for displacement says that the net displacement of a particle on the string is sum of the displacements produced by the two waves individually. Suppose we state similar principles for the net velocity of the particle and the net kinetic energy of the particle. Such a principle will be valid for

Two cars $A$ and $B$ both are moving towards each other with a speed of $7.2\text{km/hr}$. Car $A$ produces a sound of frequency $676\text{Hz}$. Find the beat frequency (Hz) heard by the person sitting in car $A$.

[Speed of sound is $340\text{m/s}$ in air]

Is there a formula to find the force of attraction between a charged and an uncharged body.If yes how it is derived. If no , why haven't anyone thought about it till now?

A parallel beam of monochromatic light of wavelength $6000\mathring{\text{A}}$ is incident normally on a single narrow slit of width $0.003\text{mm}$. The light is focused by a convex lens on a screen placed on the focal plane. The second maximum will be formed for the angle of diffraction equal to,

Two resistors of resistances $200\text{k}\Omega$ and $1\text{M}\Omega$, respectively from a potential divider with outer junctions maintained at potentials of $+3\text{V}$ and $-15\text{V}$. What is the potential at the junction $\text{X}$ between the resistors?

Four nichrome wires are connected across a power supply as shown below. In which of the following options will the wire be the least hot?​

(Here A and L represent the cross-sectional area and the length of the wire respectively.)

A coil has a resistance of $10\Omega$ and an inductance of $0.4\text{H}$. It is connected across an AC source of $6.5\text{V},\frac{30}{\pi }\text{Hz}$. The average power consumed in the circuit is

In a potentiometer experiment two cells of emf $E_1$ and $E_2$ are used in series and in conjunction and the balancing length is found to be 58 cm of the wire. If the polarity of $E_2$ is reversed, then the balancing length becomes 29 cm. The ratio $\frac{E_1}{E_2}$ of the emf is

Initially a man and a plank of the same mass $m$ are moving on smooth horizontal surface with a velocity $v\text{m/s}$ along positive x-axis. After some time man jumps along negative x-axis with a velocity $v\text{m/s}$ with respect to ground, then the speed of the plank will be

In the figure shown, the cart of mass $6m$ is initially at rest. A particle of mass $m$ is attached to the end of the light rod which can rotate freely about A. If the rod is released from rest in a horizontal position shown, determine the velocity $v_{rel}$ of the particle with respect to the cart when the rod is vertical, then

In a thermodynamic process, pressure of a fixed mass of a gas is changed in such a manner that the gas releases $20\text{J}$ of heat, when $8\text{J}$ of work is done on the gas. If the initial internal energy of the gas was $30\text{J}$, then the final internal energy will be

Figure shows a string of linear mass density $1.0\text{g/cm}$ on which a wave pulse is travelling.





Find the time taken by the pulse in travelling through a distance of $50\text{cm}$ on the string. Take $g=10{\text{m/s}}^2$

A block of mass $m$, attached to a spring of spring constant $k$, oscillates on a smooth horizontal table. The other end of the spring is fixed to a wall. The block has a speed $v,$ when the spring is at its natural length. How far will the block move on the table before coming to an instantaneous rest?

If the area of the curve enclosed by $y|y|\pm x|x|=1$ and $y=|x|$ is $A,$ then $\frac{\pi }{A}$ is

(exclude infinite area regions enclosed between the curves)

The greatest and the least resultant of two forces acting at a point are $10\text{N}$ and $6\text{N}$, respectively. If each force is increased by $3\text{N}$ and are acting at a point making an angle of ${90}^o$ with each other. Find the resultant of new forces.