2. Let\'s just say the resistance o the circuit used to create your electromagne

Question

2. Let's just say the resistance o the circuit used to create your electromagnet is about 2 ohm's. If you wanted to think of ways to manipulate your electromgnets magnetic field, would adding a 100 ohm resistor increase or decrease the strengh of the magnetic field? What would be the theorectical value of your magnetic field Gauss if the 100 ohm resistor was added to the circuit? Remember, the volatge of your battery is 1.5 volts!! Show your work!

3. If you wanted to increase your magnetic feild, how would adding a potentiometer to the circuit and turning it's knob affect the magnetic field?

4. Motors can use magnets. Do a little research and write a paragraph about how magnets are used motors. Also, name some other applocations that use electromagnets.

5. Atorque is created on a magnet when it is placed in a magnetic field. This is because the magnet tries to align itself with the magnetic field thus creating a troque. The torque N = M x B, where M is th magnetic moment vector (in telsa) of the magnetic field created by the flow of electrons from the battery. If during your expirement, the angle between the magnetic field vector and magnetic moment vector is 65 degrees, use your "Magnetic field of circuit" value Bc as B to find the torque that caused your nail to spin. (Rememeber, in the equation above, "x" does not mean multpulcation. It is the cross product whenever it is between two vectors. Also you must first convert your Bc value from gauss to tesla, 1 Telsa = 10,000 gauss). Show your work!!

6. What direction is the torque vector pointing?

7. Name three ways to make the nail spin faster

Explanation / Answer

2) it will decrease the magnetic field.It is because the current will decrease after adding the field.

i = 1.5/(100+2) = 0.0147 A

magnetic field = uoNi/2r

it becomes 2/102 times. We dont know radius and number of turns, so cant calculate exact value

3) Yes, we will increase voltage, which will increase current which will increase magnetic field.

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