PHY 102

The Simplest instrument used in detecting electric charges is

When an ebonite is rubbed with a fur, it has

Calculate the force acting on an electron of charge 1.6 x 10^-19C placed in an electric field intensity of V/m.

If the force on a charge of 0.2 coulomb in an electric field is 4N, then the electric field intensity is

Two parallel plates at a distance of 8.0 X 10^-3m apart are maintained at a potential difference of 600volts with the negative plate earthed. What is the electric field strength

The force of repulsion between two-point positive charges 5uC an 8uC separated at a distance of 0.02m apart is

A student is at a height 4m above the ground during a thunderstorm. Given that the potential difference of the thunder cloud and the ground is 10^7V, the electric field intensity created by the storm is

If 8 X 10^-2J of work is required to move 100μC of charge from point X to a point Y in an electrical circuit, the potential difference between X and Y is

Find the work done in moving a charge 2C between two points X and Y in an electric field, if the potential difference is 100Volts

If two charged plates are maintained at a potential difference of 3kV, the workdone in taking a charge of 600C across the field is

Calculate the electric potential at a distance of 20.0com from a point charge of 0.015C placed in air of permittivity

Calculate the force acting on an electron of charge 1.5 X 10^-19C placed in an field of intensity V/m

A charge of 1.0 X 10^-5C experiences a force of 40N at a certain point in space. What is the electric field intensity?

If two charged rubber rods for two charged glass rods are brought together near each other. What electrical phenomena is going to be experienced.

Calculate the distance between point charges and . If the magnitude of the electrostatic force between them is 5.70N

A parallel plate capacitor is constructed of metal plates, each with an area of 0.2 m^2. The capacitance is 7.9nF. Determine the plate separation distance.

Identify the condition under which the force acting on a charge moving through a uniform magnetic field is minimum.

When a bar magnet is broken into two pieces, which of the following are true?

The relation between the direction of current and the direction of magnetic field is?

If the cost of electricity in your area is 12 Naira per kWh, what is the total cost (capital plus operation) of using a 60-W incandescent bulb for 1000 hours (the lifetime of that bulb).

The resistance of a copper wire 200 m long is 21Ω. If its thickness (diameter) is 0.44 mm, its specific resistance is around

Three resistances of 10 ohms, 15 ohms and 30 ohms are connected in parallel. The total resistance of the combination is

The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other?

Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 0.25. If the same four wires are connected is series the effective resistance will be

A current of 16A divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is

You have to replace 1500Ω resistor in radio. You have no 1500 Ω resistor but have several 1000Ω ones which you would connect

For which of the following ‘ampere second’ could be the unit?

Two resistances R1 and R2 are connected in series across the voltage source where R1>R2. The largest drop will be across

What will be energy used by a battery if the battery has to drive 6.28 x 10^18 electrons with potential difference of 20V across the terminal?

A glass rod when rubbed with silk cloth is charged because

At what distance would be the repulsive force between two electrons have a magnitude of 1N. (e=1.6 X 10^-19C))

Compare the electric and gravitational forces of attraction between the electron and the proton in a hydrogen atom assuming that their distance of separation is 5.5 X 10^-11m. (Me = 9.1 X 10^-31 Kg, Mp = 1.7 X 10^-27Kg, e = 1.6 X 10^-19C)

Find the electric field at a point 0.2m from a charge of 20UC

A circular ring 5cm in radius has a positive charge of C. Compute the magnitude of the electric field intensity on the axis of the ring 4cm from its centre

A small object carrying a charge of 5 X 10^-9C experience a downward force of 20 X 10^-9C when placed at a certain point in an electric field. What is the electric field at the point?

What is the electric field due to a ring-shaped conductor at a distance 2.0cm along its x-axis, if the charge on the ring is 6.0uC and is radius is 0.5cm.

The magnetic field strength of a solenoid can be increased by inserting which of the following materials as the core?

A spherical surface of radius 5cm is placed in a uniform electric field of 250N/C. What is the maximum electric flux that can pass through the surface?

Two plates of a capacitor are 2.5cm apart while the potential difference between the plate is 72.0V. What is the electric field intensity on each of the plate.

The electric potential difference between points A and B is found to be 70V, find the workdone by an external agent in carrying a charge from A to B at a constant speed.

The region where a charged particles experience an electric force is known a

These are the physical facts about resistors in parallel except

What happens to the magnetic field in the solenoid when the length of the solenoid increases?

A particle with a charge of 2μC is moving at 3⋅0x10^6m/s perpendicularly through a magnetic field with a strength of 0.057. What is the magnitude of the force on the particle?

The mathematical expression for surface charge density

Resistance of 220 V, 100 W lamp will be

A parallel plate capacitor is constructed of metal plates, each with an area of 0.2 m^2. The capacitance is 7.9nF. Determine the plate separation distance.

An electron gun has parallel plates separated by 4.00cm and gives electrons 25.0keV of energy. What is the electric field strength between the plates?

Find the current that will flow inside the battery of 5 Volts and 0.02 ohms internal resistances in case its terminals are connected with each other.

What is the terminal voltage of a large 1.54-V carbon-zinc dry cell used in a physics lab to supply 2.00 A to a circuit, if the cell’s internal resistance is 0.100 Ω?

What is the internal resistance of an automobile battery that has an emf of 15.0 V and a terminal voltage of 12.0 V while a current of 8.00 A is charging it?

10 cells are connected in parallel with the internal resistance of 1 Ω and 1.5 Volts of voltage, the total voltage and total resistance are ……..

23 Calculate the resistivity of a material with a resistance of 2 Ω and a cross sectional area and length of 25cm^2 and 15cm respectively.

What current is required in the winding of a long solenoid that has1000turns uniformly distributed over a length of 0.4m in order to produce at the center of the solenoid a magnetic field of 10^-4T?

A proton traveling at 1.0 x10^7m/s in a horizontal plane passes through an opening into a mass spectrometer with a uniform 3T magnetic field directed upward. The particle then moves in a circular path through  and crashes into the wall of the spectrometer adjacent to the entrance opening. How far down from the entrance is the proton when it crashes into the wall? (The proton’s mass is 1.67x10^−27kg and its electric charge is 1.6x10^−19C).

A bar magnet is divided in two pieces. Which of the following statements is true about the force between the broken pieces if they face each other with a small separation?

A positive charge moves in parallel to a current carrying wire. What is the direction of the magnetic force on the charge?

Which is the best conductor of electricity?

All of the following are equivalent to watt except

In a series circuit with unequal resistances