Question

Q4. A rectangular coil ABCD contains 220 turns of wire and is placed between the poles of a magnet. The coil can rotate about an axis through its centre. When the current through the coil is 110 mA, the maximum moment or torque produced in the coil is 1.7 x 10^-3 N m. Pole of magnet 3.1 cm B C Pole of magnet 5.2 cm A D Axis of rotation Figure 3 (a) The plane of the coil is parallel to the magnetic field in figure 3 above. i. Calculate the magnitude of the force on side AB of the coil. (2 marks) ii. Calculate the magnitude of the force on side BC of the coil (1 mark) (b) Use your answer for (a)(i) to calculate the magnetic flux density B of the magnet. (2 marks) (c) The current in the coil is switched off. The coil is then turned through an angle of 90° in a time of 0.18 seconds. Calculate the average induced emf in the coil. (3 marks)

          Q4.
A rectangular coil ABCD contains 220 turns of wire and is placed between the poles of a magnet. The coil can rotate about an axis through its centre. When the current through the coil is 110 mA, the maximum moment or torque produced in the coil is 1.7 x 10^-3 N m.

Pole of magnet
3.1 cm
B
C
Pole of magnet
5.2 cm
A
D
Axis of rotation
Figure 3

(a) The plane of the coil is parallel to the magnetic field in figure 3 above.
i. Calculate the magnitude of the force on side AB of the coil.
(2 marks)
ii. Calculate the magnitude of the force on side BC of the coil
(1 mark)

(b) Use your answer for (a)(i) to calculate the magnetic flux density B of the magnet.
(2 marks)

(c) The current in the coil is switched off. The coil is then turned through an angle of 90° in a time of 0.18 seconds. Calculate the average induced emf in the coil.
(3 marks)

Q4.
A rectangular coil ABCD contains 220 turns of wire and is placed between the poles of a magnet. The coil can rotate about an axis through its centre. When the current through the coil is 110 mA, the maximum moment or torque produced in the coil is 1.7 x 10^-3 N m.

Pole of magnet
3.1 cm
B
C
Pole of magnet
5.2 cm
A
D
Axis of rotation
Figure 3

(a) The plane of the coil is parallel to the magnetic field in figure 3 above.
i. Calculate the magnitude of the force on side AB of the coil.
(2 marks)
ii. Calculate the magnitude of the force on side BC of the coil
(1 mark)

(b) Use your answer for (a)(i) to calculate the magnetic flux density B of the magnet.
(2 marks)

(c) The current in the coil is switched off. The coil is then turned through an angle of 90° in a time of 0.18 seconds. Calculate the average induced emf in the coil.
(3 marks)

Added by Alexander W.

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