Physics Test - 8

A stone is dropped in a lake by a person from a tower 500 m high. The sound of splash will be heard by the man after approximately, (speed of the sound in air is 340 m/s , g =10m/s2)

A source is moving towards an observer with a speed of 20 m/s and having frequency 240 Hz, and the observer is moving towards the source with a velocity of 20 m/s. What is the apparent frequency heard by the observer, if velocity of sound is 340 m/s?

An electron (q = 1.6 x 10-19 C) is moving at right angle to the uniform magnetic field of 3.534 x 10-5 T. The time taken by the electron to complete a circular orbit is

A coil having 100 turns and area of 0.001 m2 is free to rotate about an axis. The coil is placed perpendicular to magnetic field of 1.0 wb⁄m2. The resistance of the coil is10.If the coil is rotated rapidly through an angle of 180×, how much charge will flow through the coil?

An electron is travelling along the x-direction. It encounters a magnetic field in the y-direction. Its subsequent motion will be

Two circular coils 1 and 2 are made from the same wire, but the radius of the 1stcoil is twice that of the 2ndcoil. What is the ratio of potential differences applied across them, so that the magnetic field at their centres is the same?

Using mass (M), length (L), time (T) and electric current (A) as fundamental quantities, the dimensions of permittivity will be

If the velocity of light 'c', gravitational constant 'G' and Planck's constant 'h' are chosen as fundamental units, the dimensions of length 'L' in the new system are

A force 'F' is given by F = at + bt2, where 't' is the time. What are the dimensions of 'a' and 'b', respectively?

A beam of protons with velocity 4 x 10⁵ m/s enters a uniform magnetic field of 0.3 T at an angle of 60o to the magnetic field. Find the radius of the helical path taken by the proton beam.