A horse shoe magnet is placed on a top pan balance . A 3,2cm wire is fixed horizontally between the poles of the magnetic.When there is no current flowing,the balance reads 119,46 g and when a 2 A current flows , the balance reads 119,72g . Explain why the readings on the balance differ.
Determine the direction of the current.
Calculate the magnetic field strength between the magnet's poles.
Describe what happens to the wire when a direct current is applied to the wire and the wire is not fixed .
Suggest how periodic force can be produced onto the pan balance
The readings on the balance differ because when a current flows through the wire, it experiences a force in the presence of the magnetic field produced by the horseshoe magnet. This force causes a slight increase in the weight measured by the balance.
The direction of the current can be determined using the right-hand rule. If you point your right thumb in the direction of the current flow, then the direction of the magnetic field (from the north pole to the south pole) can be determined by the curling of your fingers around the wire.
To calculate the magnetic field strength, we can use the formula F = BIL, where F is the force experienced by the wire, B is the magnetic field strength, I is the current, and L is the length of the wire between the poles. Since the force is given by the difference in weight readings on the balance (0.26 g), we can rearrange the formula to solve for B:
B = (F / IL) = (0.26 g / (2 A * 3,2 cm)) = 0.040625 g/A*cm
When a direct current is applied to the wire and the wire is not fixed, it will experience a force and move in the direction determined by the right-hand rule. This movement can cause the wire to swing or rotate, depending on the setup.
To suggest how a periodic force can be produced onto the pan balance, one could attach a vibrating device or oscillator to the pan balance. This would generate periodic vibrations or oscillations in the balance, resulting in periodic force measurements.
1. The readings on the balance differ because the wire experiences a force due to the interaction between the magnetic field created by the magnet and the current flowing through the wire. This force causes a slight increase in the weight of the wire, resulting in a slightly higher reading on the balance.
2. To determine the direction of the current, we can use the right-hand rule for magnetic fields. If we hold our right hand so that the thumb points in the direction of the magnetic field between the magnet's poles (from the north pole to the south pole), and curl our fingers, the direction in which the fingers curl will indicate the direction of the current. In this case, the current is flowing into the page.
3. To calculate the magnetic field strength between the magnet's poles, we can use the following formula:
Magnetic field strength (B) = (Force on wire) / (Current * Length)
We know that the force on the wire is equal to the difference in weight measured by the balance, which is (119.72 g - 119.46 g) = 0.26 g. We also know the current is 2 A, and the length of the wire is 3.2 cm (or 0.032 m). Plugging these values into the formula, we can calculate the magnetic field strength.
B = (0.26 g) / (2 A * 0.032 m) = 4.0625 g/mA
Therefore, the magnetic field strength between the magnet's poles is approximately 4.0625 g/mA.
4. When a direct current is applied to the wire and the wire is not fixed, the wire experiences a force perpendicular to both the magnetic field direction and the current direction. This force causes the wire to move, possibly bending or twisting depending on its flexibility and the strength of the magnetic field.
5. To suggest how periodic force can be produced onto the pan balance, we can use an alternating current source. By continuously alternating the direction of the current flowing through the wire, the wire will experience a periodic force due to the interaction with the magnet's magnetic field. This periodic force will cause the wire to vibrate or oscillate, resulting in a periodic variation in the reading on the pan balance.