Question
What is an ammeter? How can we convert any galvanometer into an ammeter of given range? Explain.###Describe briefly that how and when any galvanometer is converted into an ammeter?
✓
Answer
SELF
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A block of mass 2.0kg kept at rest on an inclined plane of inclination 37° is pulled up the plane by applying a constant force of 20N parallel to the incline. The force acts for one second.
- Show that the work done by the applied force does not exceed 40J.
- Find the work done by the force of gravity in that one second if the work done by the applied force is 40J.
- Find the kinetic energy of the block at the instant the force ceases to act. Take g = 10m/s2.
A simple pendulum of length I is suspended through the ceiling of an elevator. Find the time period of small oscillations if the elevator,
- Is going up with an acceleration a0
- Is going down with an acceleration a0.
- Is moving with a uniform velocity.
Sea water at frequency ν = 4 × 108Hz has permittivity $\in\approx80\in_0$, permeability $\mu \approx\mu_0$ and resistivity $\rho=0.25\Omega-\text{m}$. Imagine a parallel plate capacitor immersed in sea water and driven by an alternating voltage source $\text{V(t)}=\text{V}_0\sin(2\pi\text{vt})$. What fraction of the conduction current density is the displacement current density?
→Write four properties of $\gamma$-rays. What will be the difference between velocity of $\gamma$-ray of wavelength 0.01 Å and X-ray of wave-length 3 Å.
→A neutron star has a density equal to that of the nuclear matter. Assuming the star to be spherical, find the radius of a neutron star whose mass is 4.0 × 1030kg (twice the mass of the sun).
Assume that a tunnel is dug along a chord of the earth, at a perpendicular distance $\frac{\text{R}}{2}$ from the earth's centre where R is the radius of the earth. The wall of the tunnel is frictionless.
→- Find the gravitational force exerted by the earth on a particle of mass m placed in the tunnel at a distance x from the centre of the tunnel.
- Find the component of this force along the tunnel and perpendicular to the tunnel.
- Find the normal force exerted by the wall on the particle.
- Find the resultant force on the particle.
- Show that the motion of the particle in the tunnel is simple harmonic and find the time period.
ODBAC is a fixed rectangular conductor of negilible resistance (CO is not connnected) and OP is a conductor which rotates clockwise with an angular velocity $\omega$ (Fig). The entire system is in a uniform magnetic field B whose direction is along the normal to the surface of the rectangular conductor ABDC. The conductor OP is in electric contact with ABDC. The rotating conductor has a resistance of $\lambda$ per unit length. Find the current in the rotating conductor, as it rotates by 180º.
→What are X-rays? If a X-ray tube is operated at V volt then prove that the minimum wavelength of X-rays emitted from the tube is given by: $\lambda_{min}=(12375/V)Å$
→How many wavelengths are emitted by atomic hydrogen in visible range (380nm-780nm)? In the range 50nm to 100nm?
The convex surface of a thin concavo-convex lens of glass of refractive index 1.5 has a radius of curvature 20cm. The concave surface has a radius of curvature 60cm. The convex side is silvered and placed on a horizontal surface as shown in figure.
→- Where should a pin be placed on the axis so that its image is formed at the same place?
- If the concave part is filled with water $\Big(\mu=\frac{4}{3}\Big),$ find the distance through which the pin should be moved so that the image of the pin again coincides with the pin.
