Two parallel wires have identical currents running through them. If the wires are 0.15m apart and attract each other with a force of 2.5 N per metre, what is the current in each wire?
A satellite of mass m in orbit around the Earth has a velocity of v. The gravitational potential energy of the satellite is:
In the field of Quantum Physics, Max Planck is known for:
A certain type of infra-red laser emits radiation with a wavelength of 930 nm. What frequency does this correspond to?
Two parallel horizontal plates are separated by a distance of d metres and have a potential difference of V volts maintained between them. Also present is a uniform magnetic field of B Teslas. A horizontal beam of electrons is directed between the plates so that it is moving at right angles to the magnetic field as shown below.
The diagram below shows an electron moving in a uniform magnetic field.
A bomber is flying horizontally at 200ms-1 at an altitude of 120m. At what horizontal distance from the target does the bomber need to drop a bomb so that it hits the target?
A diagram of a loudspeaker is shown below.
Which of the diagrams below best represents the electric field around two opposite charges?
The primary coil of an ideal transformer is connected to a voltage supply (Vp). This input voltage is varied and the corresponding voltage output in the secondary coil (Vs) is recorded. The following graph shows the results.
An electric motor with a constant voltage supply is used to raise a weight. If the weight is decreased the speed of rotation of the motor increases. Which of the following quantities will decrease in value?
Consider the diagram below, which shows a striation pattern in a cathode ray tube.
If the mass of the Earth was doubled and its radius was also doubled then the new value for the acceleration due to gravity on Earth would be:
In the graph shown, the solid curve shows how the emf produced by a simple generator varies with time. The dashed curve is the output from the same generator after a modification has been made to the generator.