The equivalent resistance between point A and B is: a) 32.5Ω b) 22.5Ω. c)2.5ΩD. d) 2.5Ω
Answer: (b) 22.5 Explanation As you can see in the equivalent circuit diagram, it depicts a series combinations of resistances... View Article
Latest Posts
Two steel wires having same length are suspended from a ceiling under the same load. If the ratio of their energy stored per unit volume is 1 : 4, the ratio of their diameters is:
Energy density =du/dv, where u is Energy v is volume ⇒ du/dv = F2/2A2y (stress = F/A) ⇒ du/dv ∝... View Article
What is the strength of the magnetic field around a thin, long straight conductor?
A Magnetic field is generally interpreted as a region where the force of magnetism acts. This force of magnetism is... View Article
A convex lens and convex mirror are placed co axially and separated by distance d. The focal length of both is 20cm each. A point object is placed at a distance 30cm from the lens. Then the value of d so that image on the object itself is
Given parameters are The focal length of the convex lens is f1=20cm. The focal length of the convex mirror is,... View Article
As shown in the figure, AB is a rod of length 30 cm and area of cross section 1.0 cm2 and thermal conductivity 336 SI units. The ends A and B are maintained at temperatures 20degreeC and 40degreeC , respectively. A point C of this rod is connected to a box D, containing ice at 0degreeC , through a highly conducting wire of negligible heat capacity. The rate at which ice melts in the box is (assume latent heat of fusion for ice Lf= 80 cal/g)
Fourier’s law states that the negative gradient of temperature and the time rate of heat transfer is proportional to the... View Article
Pressure inside two soap bubbles is 1.01 and 1.02 atmosphere. What is the ratio between their volume?
The pressure inside a bubble is greater than the pressure outside the bubble when it forms. This indicates that the... View Article
if angle of minimum deviation of a prism is equal to refracting angle of the prism, then refractive index μ of material of prism satisfies
When the entrance and departing angles of a prism are the same, the smallest deviation m occurs. The ray of... View Article
The refractive index of the material of a prism is 1.5 and its refracting angle is 6°. find the deviation produced by the prism for a small angle of incidence.
When a ray incident occurs in one medium and goes in another medium, this phenomenon is called refraction. And when... View Article
A moving mass of 8 kg collides elastically with a stationary mass of 2 kg.If KE be the initial kinetic energy of the moving mass, the kinetic energy left with it after the collision will be :
The linear momentum of a particle is defined as the product of the mass of the particle times the velocity... View Article
A bullet fired at an angle of 30 degree with the horizontal hits the ground 3.0 km away. By adjusting its angle of projection, can one hope to hit a target 5.0 km away? Assume the muzzle speed to be fixed, and neglect air resistance.
Range R of the projectile R = 3km Angle of projection, =30o Acceleration due to gravity, g = 9.8m/s2 The... View Article
The moment of inertia of thin disc of mass m and radius r, about an axis passing through one of its diameter is given by
Moment of inertia is defined as the quantity expressed by the body resisting angular acceleration which is the sum of... View Article
The velocity of light (c), acceleration due to gravity (g), and atmospheric pressure (p) are chosen a fundamental units, then the dimensions of length will be
Given: Velocity of light=C Acceleration due to gravity – g Pressure -P Let ‘L’ be the length. Let’s assume, L... View Article
Two bodies of masses ‘m’ and ‘2m’ are moving with velocities of ‘2v’ and ‘v’ respectively. calculate the ratio of theIRR (i) momentum (ii) inertia.
(i) Inertia – Inertia depends on mass, And since the mass of the two body is the same, therefore their... View Article
Two spheres of radii 12 cm and 16 cm have equal charge. The ratio of their energies is :
A spherical capacitor consists of a solid or hollow spherical conductor, surrounded by another hollow concentric spherical of different radius.Capacitance... View Article
In the arrangement shown in fig. the ends p and q of an unstretchable string move downwards with a uniform speed u. pulleys a and b are fixed. mass m moves upwards with a speed of
Let the speed of the block of mass M is V. The point on the thread just connected to mass... View Article
The apparent frequency of the whistle of an engine changes in the ratio 9 8 as the engine passes a stationary observer. if the velocity of sound is 340 m/s, then the velocity of engine is
Answer: 20 m/s The Doppler effect is the change in the frequency of a wave observed by an observer who... View Article
In an oscillating L-C circuit, the maximum charge on the capacitor is Q . The charge on the capacitor, when the energy is stored equally between the electric and magnetic field is.
Here, the given charge on the capacitor is Q. The meaning of the charge on a capacitor, when the energy... View Article
Position-time graph for a particle is shown in the figure. Starting from t=0, at what time t, the average velocity is zero?
We need to discover a point where total displacement equals zero in order to find the time instant when average... View Article
in young’s double slit experiment, fringe width observed is β. if the frequency of the source is tripled, then new fringe width will become
The formula that relates the fringe width with the wavelength of the source is given as, ⇒β=λD/d So, we can... View Article
A force of 5 n gives a mass m1 an acceleration of 10 m s–2 and a mass m2 an acceleration of 20 m s-2 . what acceleration would it give if both the masses were tied together?
If we consider that m1 is the mass of the first object and a1 is the acceleration due to the... View Article
