Theory

CH9 - MAGNETS AND CURRENTS

(a) The transformer in Fig. 8.1 is used to convert 240V a.c. to 6V a.c.Fig. 8.1(i) Using the information above, calculate the number of turns on the s...

2010 Summer

2

Theory

CH9 - MAGNETS AND CURRENTS

(a) Fig. 9.1 illustrates the left hand rule, which helps when describing the force on a current-carrying conductor in a magnetic field.Fig. 9.1One dir...

2010 Summer

1

Theory

CH9 - MAGNETS AND CURRENTS

(a) In Fig. 8.1, a magnet is moving towards one end of a solenoid connected to a sensitive centre-zero meter. During this movement a current is induce...

2011 Winter

3

Theory

CH9 - MAGNETS AND CURRENTS

The north pole of a bar magnet is placed next to end P of an iron bar PQ, as shown. As a result, magnetic poles are induced in the iron bar. [Image_1...

2009 Summer

3

Theory

CH9 - MAGNETS AND CURRENTS

An electromagnet is used to separate magnetic metals from non-magnetic metals. Why is steel unsuitable as the core of the electromagnet?A It forms a p...

2009 Summer

2

Theory

CH9 - MAGNETS AND CURRENTS

Which statement about a magnet is not correct?A. It can attract another magnet.B. It can attract an unmagnetised piece of iron.C. It can repel another...

2010 Winter

2

Theory

CH9 - MAGNETS AND CURRENTS

A chain of steel nails and a chain of iron nails hang from a strong magnet. The chains are then carefully removed from the magnet.What happens to the ...

2010 Winter

2

Theory

CH9 - MAGNETS AND CURRENTS

Four nails, A, B, C and D, are tested to find which makes the strongest permanent magnet.One of the nails is placed against a bar magnet and the numbe...

2011 Winter

3

Theory

CH9 - MAGNETS AND CURRENTS

A horseshoe magnet is brought near to an unmagnetised iron bar. [Image_1: Diagram of horseshoe magnet with labeled N and S poles near an iron bar] W...

2011 Winter

3

Theory

CH9 - MAGNETS AND CURRENTS

Which diagram represents the direction of the magnetic field around a straight wire carrying a current out of the page?

2011 Winter

4

MCQ

CH1 - MEASUREMENTS AND UNITS

Which quantity can be measured directly using a micrometer screw gauge?

2019 Summer

1

MCQ

CH2 - FORCES AND MOTION

The velocity of an object increases from 30 m/s to 50 m/s in 5.0 seconds.What is the average acceleration of the object?

2019 Summer

1

MCQ

CH2 - FORCES AND MOTION

A heavy metal ball falls vertically downwards through air past four equally spaced levels J, K, L and M.The times taken to fall from one level to the ...

2019 Summer

1

MCQ

CH2 - FORCES AND MOTION

A body is moved from place X to place Y where the gravitational field strength is different. What happens to its mass and to its weight due to the mov...

2019 Summer

1

MCQ

CH1 - MEASUREMENTS AND UNITS

The diagrams show four solid blocks with their dimensions and masses.Which block has the greatest density?

2019 Summer

1

MCQ

CH3 - FORCES AND PRESSURE

A student wishes to determine the spring constant of a spring where it obeys Hooke’s law. Different loads are hung from the spring and its length is...

2019 Summer

1

MCQ

CH2 - FORCES AND MOTION

A mass of 20 kg is held stationary by a rope passing over a frictionless pulley. What is the tension $T$ in the rope?

2019 Summer

2

MCQ

CH2 - FORCES AND MOTION

A boat starts moving across a river at velocity $v$ perpendicular to the river bank. The boat encounters a current along the river of velocity $u$, as...

2019 Summer

1

MCQ

CH2 - FORCES AND MOTION

A ball of mass 0.50 kg falls and hits the floor at 10 m/s. It rebounds at speed 8.0 m/s, as shown. The collision between the ball and the floor las...

2019 Summer

1

MCQ

CH4 - FORCES AND ENERGY

An object falls from the top of a building that is 25 m high. Air resistance is negligible.What is the speed of the object when it hits the ground?

2019 Summer

3