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# Unit 9: How do electrons push large needles?

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Unit test

If magnetic field exerts forces on individual charged particles, will it also exert force on a neutral current-carrying wire? Let's find out!

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### Practice

- Force on a current in a magnetic fieldGet 3 of 4 questions to level up!
- Force on a current-carrying wire in a magnetic field (intermediate)Get 3 of 4 questions to level up!

Level up on the above skills and collect up to 160 Mastery points

### Practice

- Torque acting on current loopsGet 3 of 4 questions to level up!
- Electric motor: parts and functionsGet 3 of 4 questions to level up!
- Electric motor: workingGet 3 of 4 questions to level up!

If we attach a coil to that rotating motor, we can move needles. But how do we make sure that the needle stops moving at a certain angle? Let's make a current measuring device!

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### Practice

- Working of a moving coil galvanometerGet 3 of 4 questions to level up!
- Convert galvanometer into ammeter/voltmeterGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 400 Mastery points

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Level up on all the skills in this unit and collect up to 700 Mastery points!