1)The polarity of an electromagnet can be determined using the second right-hand rule.
true.
2)Current passing through a conductor is increased from 10 A to 15 A. This decreases the strength of the magnetic field produced by the conductor.
false.
1) I m not familiar with which right hand rule is "second", but I found a web site that says:
<<The polarity of the electromagnet is determined by the direction the current. The north pole of the electromagnet is determined by using your right hand. Wrap your fingers around the coil in the same direction as the current is flowing (conventional current flows from + to -). The direction your thumb is pointing is the direction of the magnetic field, so north would come out of the electromagnet in the direction of your thumb.>>
2) True. Magnetic field strength is proportional current.
False. Increasing the current passing through a conductor will generally increase the strength of the magnetic field produced by the conductor, assuming all other factors remain constant.
To determine the polarity of an electromagnet using the second right-hand rule, follow these steps:
1. Hold the wire of the electromagnet in your right hand with your thumb pointing in the direction of the current flow.
2. Wrap your fingers around the wire in the direction that the magnetic field lines encircle the wire.
3. Your fingers will now curl in the direction of the magnetic field lines. This curl represents the polarity of the electromagnet. The direction in which your fingers curl indicates the direction of the north pole of the electromagnet.
So, the statement that the polarity of an electromagnet can be determined using the second right-hand rule is true.
Regarding the second statement, when the current passing through a conductor is increased, it actually increases the strength of the magnetic field produced by the conductor. This is defined by Ampere's law, which states that the magnetic field strength is directly proportional to the current passing through the conductor. Therefore, the statement that increasing the current from 10 A to 15 A decreases the strength of the magnetic field is false.