Electric Current and Magnetic Fields

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

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

The direction of the force on a current-carrying wire placed in a magnetic field depends on

• the direction of the current

• the direction of the field

• the direction of current as well as field

• neither the direction of current nor the direction of field

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

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

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NGSS.HS-PS2-5

NGSS.HS-PS3-5

The magnetic field lines due to a straight wire carrying a current are

• straight

• circular

• parabolic

• elliptical

Tags

NGSS.HS-PS2-5

A straight wire of length 0.5m and carrying current 1.2A is placed in uniform magnetic field of induction 2T, applied perpendicular to the length of the wire. The force on the wire is

• 2.4 N

• 1.2 N

• 3.0 N

• 2.0 N

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

What kind of magnet can be turned on and off?

• refridgerator magnet
• electromagnet
• magnetite
• iron

Tags

NGSS.HS-PS2-5

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

• 
• 
• 
• 

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

1) A wire carries a current, creating a magnetic field around itself as shown. The current in the wire is:

• A. Directed to the right

• A. Directed to the left

• A. Equal to the magnetic field

• In the same direction as the magnetic field

Tags

NGSS.HS-PS2-5

1) A wire carries current I directed to the right as shown in the figure below. What is the direction of the magnetic field generated by the wire at point A?

• To the right

• To the left

• Toward the wire

• Into the page

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

A straight wire carrying a 9.0 A current is in a uniform magnetic field oriented at right angles to the wire. When 75 cm of wire is in the field, the force on the wire is 1.2 N. What is the strength of the magnetic field (B)? HINT: F=I.L.B

• = 0.18 N
• = 0.18 T
• = 0.18 Cm
• = 0.18 

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5