In which arrangement is the force on wire W the greatest in magnitude?
A hand-turned electric generator has its outputs connected to a CRO. The CRO screen appears below:
In an experiment to demonstrate the photoelectric effect, it was found that when light with a frequency f and an intensity I was shone on the cathode, the voltage needed to completely stop the photoelectric current was V volts. The effect of increasing the incident light intensity shining on the cathode is that the voltage V needed to be:
ensuring the net force on the object remains zero.
A gaseous planet expands and contracts in size while maintaining the same mass.
One of the advantages of AC induction motors compared to other electric motors is that they:
The maximum torque produced by a single-coil DC motor is 2.8 N m. This torque could be produced if the motor had 200 turns on the coil and:
The gravitational potential energy of an object near Earth’s surface is changed. This could be done by:
Hertz observed the photoelectric effect in his experiments with radio waves but he did not investigate this phenomenon further.
Which graph most closely resembles the path taken by a projectile fired from the Earth’s surface, ignoring air friction?
The concept of time dilation is a direct consequence of:
Wire X and structure Y are shown in the illustrations below.
The slingshot effect can be best summarised as:
The one spare seat at the back of the bus is taken by a passenger who moves from the second back row. Their seat is then taken by a passenger from the row in front who moves back a row, and so on until there is a spare seat at the front. This movement is a model for the movement of electrons in:
A cathode ray tube with a rotating paddle wheel turns when the cathode rays strike the paddles. This is evidence that cathode rays possess: