Physics

Two charged thin infinite plane sheets of uniform surface charge density σ+and σ−, where |σ+| > |σ−|, intersect at right angle. Which of the following best represents the electric field lines for this system.

Starting from the origin at time t = 0, with initial velocity 5ĵ ms⁻¹, a particle moves in the x-y plane with a constant acceleration of (10î + 4ĵ)ms⁻². At time t, its coordinates are (20 m, y₀m). The values of t and y₀ are, respectively:

A air bubble of radius 1 cm in water has an upward acceleration 9.8 cm s?². The density of water is 1gmcm?³ and water offers negligible drag force on the bubble. The mass of the bubble is: (g = 980 cm/s²).

For a transverse wave traveling along a straight line, the distance between two peaks (crests) is 5 m, while the distance between one crest and one trough is 1.5 m. The possible wavelengths (in m ) of the waves are:

Match the Cp/Cv ratio for ideal gases with different type of molecules:
|

Match the correct option?

A two point charges 4q and –q are fixed on the x-axis at x = −d/2 and x = d/2, respectively. If a third point charge ' q ' is taken from the origin to x = d along the semicircle as shown in the figure, the energy of the charge will:

A small bar magnet placed with its axis at 30° with an external field of 0.06 T experiences a torque of 0.018Nm. The minimum work required to rotate it from its stable to unstable equilibrium position is:

A beam of plane polarized light of large cross-sectional area and uniform intensity of 3.3Wm⁻² falls normally on a polarizer (cross sectional area 3 * 10⁻⁴ m² ) which rotates about its axis with an angular speed of 31.4rad/s. The energy of light passing through the polariser per revolution, is close to:

The specific heat of water = 4200 J kg⁻¹ K⁻¹ and the latent heat of ice = 3.4 * 10⁵ J kg⁻¹. 100 grams of ice at 0°C is placed in 200 g of water at 25°C. The amount of ice that will melt as the temperature of water reaches 0°C is close to (in grams):

A wire A, bent in the shape of an arc of a circle, carrying a current of 2 A and having radius 2 cm and another wire B, also bent in the shape of arc of a circle, carrying a current of 3 A and having radius of 4 cm, are placed as shown in the figure. The ratio of the magnetic fields due to the wires A and B at the common centre O is: