How is an electromagnet different from a permanent magnet? | StemPy Lab

Help Contact For teachers and institutes

Mock Tests Classes Groups

StemPy Lab

Learn. Solve. Code the solutions. Test yourself.

Live examsFree mock exams, timed and rankedEveryone starts together, and your score and rank come the moment it ends.See the exams →

Learn

Physics
Chemistry
Mathematics
Biology
Python Programming
Statistics & Data Science
Classes
Groups

Practice

Problems
Quizzes
Mock Tests
Question Sets
Exams
Certificates
Python Labs
AI Practice Generator
Student-Created Tests

Community

Discussions
Resources
Notes
Blog

Account

Dashboard
My Content
Profile
Log in

© 2026 senLearn. All rights reserved.Help About Contact Privacy Policy Terms of Use Refund Policy

How is an electromagnet different from a permanent magnet? | StemPy Lab

Quizzes
How is an electromagnet different from a permanent magnet?

PhysicsEasyHigh School (9–10)Electricity & Magnetism › Magnetic Effects of Current

Created by StemPy Lab

How is an electromagnet different from a permanent magnet?

← All Quizzes

← An electrician checks a hidden wire with a field meter. Held 4 cm from the wire, it reads 25 µT. Find the current, using B = 2 × 10⁻⁷ I/r in SI units.A student says: Inside a solenoid the field is zero, because the two sides of each turn cancel each other. What is the mistake? →

More onElectricity & Magnetism › Magnetic Effects of Current

Discussion (0)

Log in to join the discussion.

Loading…

More questions on this topic

Iron filings are sprinkled on a card round a long coil that carries a current. The pattern outside…Easy
What keeps the coil of a DC motor turning in one direction?Medium
In a class demonstration, a copper rod rests on two rails, and 0.12 m of it lies between the poles…Easy
Near a power cable, a meter reads 60 µT at 2 cm. Later the cable carries half the current, and the…Medium
What does a relay do?Medium

All questions on this topic →

Problems on this topic

The pointer of a galvanometer turns 80° for a full-scale current of 40 mA, and the turn is…Medium
Explain how a loudspeaker makes sound from a changing current.Medium
A motor coil has 80 turns, each of area 0.005 m².Hard
A coil of 150 turns, each of area 0.003 m², carries 1.2 A in a field of 0.2 T.Medium

All problems on this topic →