Physics Test 11...

If the condenser shown in the circuit is charged to 5V and connected in the circuit. The charge on the condenser at t = 12 µs will be : 

A Geostationary satellite is revolving around the earth. To make it escape from gravitational field of earth, its velocity must be increased-

Two charges -9µC and +9µC are placed at the points P (1, 0, 4) m and Q (2, –1, 5) m located in the electric field  Calculate torque acting on the dipole.

There are two bulbs B₁ (P, V), B₂ (P, 2V) their rated power and voltages are mentioned with them. Calculate the ratio of consumed power w₁ and w₂ ?

Calculate coefficient of mutual inductance of coil C₁ and C₂.

Figure shows the graph of stopping potential versus the frequency of a photosensitive metal. The plank's constant and work function of the metal are- (V and υ₀ are two different constant.)

For a substance the average life for α-emission is 3240 years and for β emission is 810 years. After how much time the 1/4 of the material remains by simultaneous emission :- [ℓn2 = 0.693]

A bomb is projected with a velocity of 5 m/s at an angle θ from the horizontal ground. It explodes in two equal fragments at the maximum height. One of the fragments comes to rest just after explosion. Centre of mass of the fragments falls on the horizontal ground at a horizontal distance x from the point of projection. Taking sinθ = 4/5 and g = 10 m/s², the value of x would be

A particle of mass 2kg initially moves with a velocity of  Then coefficient of resitution will be 

Consider diffraction by a slit of small width. O is point of central maxima, A is point closest to O where intensity is zero. Now if width of slit is increased slightly.