Magnetic field due to circular loop & solenoid

At the centre of which of the following four circular rings the magnetic field is the strongest for equal magnitude of current?

• Loop 1

• Loop 2

• Loop 3

• Loop 4

Magnetic field inside a long solenoid carrying current is

• same at all points (uniform)

• different at poles and at the centre

• zero

• different at all points

If current is passed in a spring with a weight hung on it, then the spring

• will be compressed

• will expand

• compression and expansion both will occur

• no change in the state of the spring

Refer the diagram. The right face of the loop acts as North pole and left side of loop acts as south pole

• False

• True

The nature of magnetic field line passing through the centre of current carrying circular loop is :

• circular

• ellipse

• parabolic

• straight line

The magnetic field B inside a long ideal solenoid is independent of:

• the current

• the core material

• the spacing of the windings

• the cross-sectional area of the solenoid

what is the earths magnetic field useful for 

• deflecting the solar wind, charged particles that come from the Sun.
• wind
• sun
• light

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Ancient people discovered magnetic rocks called lodestone. What did they use them for?

• fires
• compasses
• sculptures
• weapons

Why does a compass needle point north?

• The compass is a bar magnet
• Because north is up
• Because it's magic
• It lines up with the Earth's magnetic field

Tags

NGSS.MS-PS2-5

What is the shape of a magnetic field around a wire?

• 
• 
• 
• 

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5