In a uniform electric field, a cube of side 1 cm is placed. The total energy stored in the cube is 8.85μJ. The electric field is parallel to four of the faces of the cube. The electric flux through any one of the remaining two faces is.

Anonymous User Physics 28 Apr, 2019 1 Answer 1107 views

Suppose that two heat engines are connected in series, such that the heat exhaust of the first engine is used as the heat input of the second engine as shown in figure. The efficiencies of the engines are n1 and n2, respectively. The net efficiency of the combination is given by?

Anonymous User Physics 28 Apr, 2019 1 Answer 1240 views


A magnet is suspended in such a way when it oscillates in the horizontal plane. It makes 20 oscillations per minute at a place where dip angle is 30 and 15 oscillations per min at a place where dip angle is 60 . Find the ratio of the total earth's magnetic field at the two places?

Anonymous User Physics 26 Apr, 2019 0 Answer 104 views














A simple pendulum is suspended in a lift which 5. is going up with an acceleration 5 m/s^2. An electric field of magnitude 5 N/C and directed vertically upward is also present in the lift. The charge of the bob is 1 mC and mass is 1 mg. Taking g =  and length of the simple pendulum 1m, the time period of the simple pendulum is

Anonymous User Physics 20 Apr, 2019 1 Answer 269 views




X-ray diffraction studies show that copper crystallises in an fcc unit cell with cell edge of 3.608×10-8 cm. In a separate experiment, copper is determined to have a density of 8.92 g/cm3, calculate the atomic mass of copper

Rajkumar Yadav Chemistry 19 Apr, 2019 1 Answer 147 views






A number consists of three digits which are in G.P. the sum of the right hand and left hand digits exceeds twice the middle digit by 1 and the sum of the left hand and middle digits is two third of the sum of the middle and right hand digits. Find the numbers?

Anonymous User Maths 18 Apr, 2019 1 Answer 805 views















A sounding body emitting a frequency of 150 Hz is dropped from a height. During its fall under gravity it crosses a balloon moving upwards with a constant velocity of 2m/s one second after it started to fall. The difference in the frequency observed by the man in balloon just before and just after crossing the body will be:

Given that -velocity of sound = 300m/s; g = 10m/s2.

(A) 4

(B) 6

(C) 8

(D) 12

Kirti Gulati Physics 16 Apr, 2019 1 Answer 66 views




A passenger is standing d distance away from a bus. The bus begins to move with constant acceleration a. To catch the bus, the passenger runs at a constant speed u towards the bus. What must be the minimum speed of the passenger so that he may catch the bus?

Anonymous User Physics 15 Apr, 2019 1 Answer 190 views

A driver takes 0.30 s to apply the brakes after he sees a need for it. This is called the reaction time of the driver. If he is driving a car at a speed of 54 km/h and the brakes cause a deceleration of 5.0m/s2, find the distance travelled by the car after he sees the need to put the brakes on ?

Anonymous User Physics 15 Apr, 2019 1 Answer 76 views