Question # 1

Gauss's law a most useful in cases where the charge distributions.

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Are made up of discrete point charges

Are finite in their spatial extent

Give rise to inverse square law fields

Posses a certain amount of symmetry

What is measured by the energy dissipated when a source drives a unit charge round a complete circuit.

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Electromotive force

Potential difference

Power

Resistance

A pure choke consumes

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No power

Maximum power

Minimum power

Average power

If the current in a wire which is placed perpendicular to a magnetic fields increases the force on the wire.

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Increases

Decreases

Remain the same

Will be zero

The sum of positive and negative peak values are usually written as.

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rms value

p-p value

Peak value

Instantaneous value

What is a measure of the separation of positive and negative electrical charges in a system of charges.

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charge polarization

Electric dipole moment

Electric field

Electrostatic induction

A plug connoted to a table lamp contains a 3 A fuse Why is the fuse needed.

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To increase the resistance of the circuit

To make it easier for the current to flow

To protect the wiring form overheating

To reduce the voltage across thelamp

The energy supplied in charging a capacitor resides after the charging in.

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The magnetic field

The electric field

the battery

The moving conduction charges

Which one of the following describes a measure of opposition to alternating current.

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Electrical impedance

Capacitance

Inductance

Admittance

The magnitude of induced emf during electromagnetic induction is controlled by.

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Magnetic flux

electric flux

Electric field

Magnetic field

What is the term for an motion of charge from one region to another.

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electric charge

Electric current

Electric field

Electric potential

The susceptibility of a paramagnetic material is

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negative

Positive

Zero

Infinity

Which method of charging is involved in making lightning.

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Induction

Friction

Contact

Convection

Which of the following is an example of induced magnetism.

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A compass needle pointing north

A north pole attracting iron filings

A northpole repelling a north pole

The coil of a motor turning in a magnetic field.

A battery drives 50 C of charge round a circuit. The total work done is 750 J What is the electromotive force of the battery.

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0.07 V

15 V

700 V

1500 V

The electric supply line in houses works at 220 V what will be the amplitude of emf.

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120 V

331 V

220 V

440 V

Which law states that magnetization is inversely proportional to temperature for a fixed value fo the field.

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Curie's law

Voltmeter

Ammeter

Wattmeter

Inductance are measured in

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Coulombs

Volts

Henrys

Farads

If a di electric is placed between the plates of a capacitor, its capacitance.

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Decreases

Increases

Remains unaffected

Is zero

In order to measure the true emf of an electrolytic cell it is necessary that.

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The measurement be made while charging the cell

No current be drawn from the cell

The cell be connected into a type circuit

The cell be connected into a parallel type circuit

What for is a modulator circuit used.

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To eliminate carrier waves

To superpose the radio frequency signal on the carrier waves

To transmit the signal

To create sound waves

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