Physics Test - ...

The charge on a particle Y is double the charge on particle X. These 2 particles X and Y after being accelerated through the same potential difference enter a region of uniform magnetic field and describe circular paths of radii r₁ and r₂ respectively. Find ratio of the mass of X to that of Y.

An electron of mass 'm' and charge 'q' is travelling with a speed 'v' along a circular path of radius 'r' at right angles to a uniform of magnetic field B. If speed of the electron is doubled and the magnetic field is halved, then what would be the resulting path?

A proton of energy 8 eV is moving in a circular path in a uniform magnetic field. What will be energy of an alpha particle moving in the same magnetic field and along the same path?

A copper wire of length 1 m and radius 1 mm is connected in series with an iron wire of length 2 m and radius 3 mm and a current is passed through the wires. Find the ratio of the current density in the copper and iron wires.

How much amount of charge is flowing in 2 minutes in a wire of resistance 10 when a potential difference of 20 V is applied between its ends?

The length of a given cylindrical wire is raised by 100%. What will be the change in the resistance of the wire due to the consequent decrease in diameter?

A magnet vibrates in a horizontal plane at 2 places A and B using vibration magnetometer. Its respective periodic times are 2 s and 3 s and at these places the earth's horizontal components are H_A and H_B respectively. Then what will be the ratio between H_A and H_B?

Two charges of 4 mu C each are situated at the corners A and B of an equilateral triangle of side length 0.2 m in air. What is the electric potential at C?

2 ions having masses in the ratio 1:1 and charges 1:2 are projected into uniform magnetic field perpendicular to the field with speeds in the ratio 2:3. What is the ratio of the radii of circular paths along which the 2 particles move?

2 magnets are held together in a vibration magnetometer and are allowed to oscillate in the earth's magnetic field with like poles together, 12 oscillations per minute are made but for unlike poles together only 4 oscillations per minute are executed. What will be ratio of their magnetic moments?