Magnetic Effects of Electric Current (10 Science)
Electric current produces magnetic fields, and these magnetic effects have numerous practical applications. Understanding magnetism helps us use electric d
TL;DR: Electric current produces magnetic fields, and these magnetic effects have numerous practical applications. Understanding magnetism helps us use elect…
Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated
Electric current produces magnetic fields, and these magnetic effects have numerous practical applications. Understanding magnetism helps us use electric d
Magnetic Effects of Electric Current MCQs with Answers & Explanations
Q1. Which scientist demonstrated the magnetic effect of electric current?
- Faraday
- Oersted ✓ (correct)
- Coulomb
- Ampere
Q2. What is a solenoid?
- A coil with two terminals
- A long coil of wire with many turns ✓ (correct)
- A straight wire
- A magnet
Q3. What is the direction of magnetic field around a current-carrying wire according to the right-hand rule?
- Along the wire
- Perpendicular to the wire
- Circular around the wire ✓ (correct)
- Downward only
Q4. What is an electromagnet?
- A permanent magnet
- A magnet made by passing electric current through a coil ✓ (correct)
- A magnet found in nature
- A magnet without poles
Q5. Which device uses electromagnetic induction to produce electric current?
- Motor
- Generator ✓ (correct)
- Transformer
- Solenoid
Q6. What is Faraday's law of electromagnetic induction?
- Current is proportional to voltage
- Induced EMF is proportional to rate of change of magnetic flux ✓ (correct)
- Force is proportional to current
- Resistance is constant
Q7. What is Lenz's law?
- Current follows Ohm's law
- Induced current opposes the change that causes it ✓ (correct)
- Voltage is constant
- Power is constant
Q8. What is the function of a transformer?
- Convert AC to DC
- Change voltage and current of AC ✓ (correct)
- Store electrical energy
- Produce light
Q9. In a DC motor, what is the function of the split ring commutator?
- Reduce friction
- Produce magnetic field
- Reverse current direction periodically ✓ (correct)
- Increase voltage
Q10. What is the unit of magnetic flux?
- Tesla
- Weber ✓ (correct)
- Ampere
- Volt
Frequently Asked Questions
How does a DC motor work?
A DC motor works by passing current through a coil in a magnetic field. The magnetic force on current-carrying conductors produces a torque, causing the coil to rotate. The commutator reverses current direction periodically to maintain continuous rotation.
What is the difference between a motor and a generator?
A motor converts electrical energy to mechanical energy by using electromagnetic force. A generator converts mechanical energy to electrical energy using electromagnetic induction. They have opposite functions.
More 10 Science MCQs
- Light Reflection and Refraction
- Electricity
- Acids Bases and Salts
- Life Processes
- Carbon and its Compounds
- Metals and Non-metals
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