Physics Test - ...

The 4 wires are made of the same material and are at the same temperature. Determine the wire having highest electrical resistance.

A spherical conductor of radius 2m is charged to a potential of 120 V. It is now kept inside another hollow spherical conductor of radius 6m. Find the potential to which the bigger sphere would be raised.

The charge of an electron is 1.6×10^-19 C. When the beam current is 16 mA, then how many electrons strike the screen of a cathode ray tube each second?

A ball of mass 1 g and charge 10^-8 C moves from a point A, where potential is 600 volt to the point B, where potential is zero. Velocity of the ball at the point B is 20 cm/s. What will be the velocity of the ball at the point A?

In the given figure, the electron enters into the magnetic field. In which direction it deflects?

A current I is passing through a wire having two sections P and Q of uniform diameters d and d/2 respectively. If the mean drift velocity of electrons in sections P and Q is represented by v_P and v_Q respectively, then which of the following relation is true?

3 identical point charges as shown are kept at the vertices of an isosceles right angled triangle. Determine the numbered vectors that coincides in direction with the electric field at the mid-point M of the hypotenuse?

Which of the following statement is correct?

A rectangular loop carrying a current (i) is placed near a long straight wire such as the wire is parallel to the one of the sides of the loop and is in the plane of the loop. The loop will _____, if a steady current I is established in wire as shown in figure.

The period of oscillations of a magnetic needle in a magnetic field is 1 s. What will be the time period, if the length of the needle is halved by cutting it?