What is correct about the power dissipated in the resistors?
The power dissipated is greatest in resistor X.
The power dissipated is greatest in resistor Y.
The power dissipated is greatest in resistor Z.
The power dissipated is the same in all resistors.
the power supplied by the cell per unit current from the cell.
the force that the cell provides to drive electrons round a circuit.
the energy supplied by the cell per unit current from the cell.
the potential difference across the terminals of the cell.
The direction of the magnetic field at point P is
out of the plane of the paper.
into the plane of the paper.
to the left.
to the right.
What changes occur in the ammeter reading and in the voltmeter reading when the resistance of the variable resistor is increased?
Which of the following is the resistance of R?
Which of the following is a correct statement?
The current through X is greater than that through Z.
The potential difference across Z is greater than that across Y.
The potential difference across resistor X and Y together is the same as that across Z.
The current through Z is less than the total current through X and Y.
The electromagnetic force on Q is in the same plane as that of the wires. What is the direction of the electromagnetic force acting on Q?
What is the direction of the magnetic force on the particle?
To the left
To the right
Into the page
Out of the page
What is the force acting on an alpha particle travelling at 2v parallel to a magnetic field of strength 2B?
Which of the following gives the ratio power dissipated in X
The top plate is positively charged and the bottom plate is negatively charged. There is a magnetic field in the shaded region PQRS. The particle continues to move in a horizontal straight line between the plates. Which of the following correctly describes the magnetic field direction?
Into plane of paper
Out of plane of paper
What is the direction in which the electrons will be deflected?
Towards the N pole of the magnet
Towards the S pole of the magnet
What is the resistance of R?
The resistance of Y is R.
What is the resistance of this series combination?
`l` is made from a metal of mass m. It has a resistance R.
Two resistors, each of length 2`l` and mass `m/2,` are then created from the same volume of the metal.
What is the resistance of the two resistors when connected in parallel?
resistivity of X × length of X = resistivity of Y × length of Y
resistivity of X × cross sectional area of X = resistivity of Y × cross sectional area of Y
450 C of charge flows through the motor and 9000 J of energy are converted in the motor. 1800 J are dissipated in the cell. The emf of the cell is
The power supply has an emf of 12 V and negligible internal resistance. What is the difference between the maximum and minimum values of voltage V across the 3 Ω resistor?
At which points is the net electric field directed to the right?
X and Y only
Z and Y only
X and Z only
X, Y and Z
`I` is at right angles to a uniform magnetic field of strength B. A magnetic force F is exerted on the wire. Which force acts when the same wire is placed at right angles to a uniform magnetic field of strength 2B when the current is `I/4?`
Where can the electric field be zero?
position I only
position II only
position III only
positions I, II and III
`v`. The electron is followed by an alpha particle moving with the same initial velocity as the electron. A uniform magnetic field is directed out of the plane of the paper.
The electron’s path is undeflected. The path of the alpha particle will be
deflected out of the plane of the paper.
On which side of the pipe does negative charge accumulate?
The electromagnetic force acting on the electron
causes the electron to decrease its horizontal speed.
causes the electron to increase its horizontal speed.
is parallel to the field lines and in the opposite direction to them.
is perpendicular to the field direction.
Which of the following gives resistance of X
What is the magnitude of the electric field strength at P?
The ratio of potential difference across a component to the resistance of the component
The power delivered by a battery per unit potential difference
The rate of flow of electric charge
The energy per unit charge dissipated in a power supply
the same direction as the current.
the opposite direction to the current.
the same plane as the wire.
any plane perpendicular to the wire.
A moving electron
A moving neutron
A proton and electron moving away from each other
A proton and electron moving towards each other
What is the direction of the magnetic force on the electron?
The distance between the electrodes is now changed to `1/3d.`
What is the gain in kinetic energy of an electron that is accelerated from one electrode to the other?
What is the emf of the battery?
on any charged objects.
charged hollow spheres.
charged solid spheres.
What is the magnitude of the current in the cell?