Paper 2 H - SAMPLE SET 1 Q7
(7) (a) A straight piece of wire is 0.713m long.
It is placed at right angles to a uniform magnetic field of 0.47T.
The force on the wire is 0.089N.
Calculate the current in the wire.
Use an equation from the formula sheet. Give your answer to an appropriate number of significant figures. (2)
It is placed at right angles to a uniform magnetic field of 0.47T.
The force on the wire is 0.089N.
Calculate the current in the wire.
Use an equation from the formula sheet. Give your answer to an appropriate number of significant figures. (2)
current = ............................................... A
(b) A student investigates the relationship between the magnetic flux density and the electromagnetic force on a current-carrying wire.
The student has the equipment shown in Figure 19.
The student has the equipment shown in Figure 19.
The student varies the number of magnets and measures the force on the wire using the force meter.
The results are shown in Figure 20.
The results are shown in Figure 20.
The student decides that his equipment is not sufficiently sensitive.
Give three ways the student should develop his investigation to improve the quality of his results. (3)
1 .....................................................................................................................
2 ....................................................................................................................
3 ....................................................................................................................
(c) Figures 21 and 22 show different voltages that can be applied across a wire.
Give three ways the student should develop his investigation to improve the quality of his results. (3)
1 .....................................................................................................................
2 ....................................................................................................................
3 ....................................................................................................................
(c) Figures 21 and 22 show different voltages that can be applied across a wire.
Explain which of the voltages in Figures 21 and 22 cause an a.c. current in the wire. (2)
(d) A power transmission wire hangs so that it is at right angles to the Earth’s magnetic field.
Although this magnetic field is constant, the cable experiences a changing force.
Explain why the force experienced by the cable changes. (4)
(Total for Question 7 = 11 marks)
(d) A power transmission wire hangs so that it is at right angles to the Earth’s magnetic field.
Although this magnetic field is constant, the cable experiences a changing force.
Explain why the force experienced by the cable changes. (4)
(Total for Question 7 = 11 marks)