Gr 11 Physical Sciences: Ch 8.1 Magnetic field associated with a current

What is the orientation of the magnetic field lines produced by a current-carrying wire?

At an angle of 45 degrees to the direction of the current flow
Parallel to the direction of the current flow
Randomly oriented around the wire
Perpendicular to the direction of the current flow (correct)

What is the effect of a stronger current on the magnetic field around a wire?

A weaker magnetic field is produced
The direction of the magnetic field changes
The magnetic field remains the same
A stronger magnetic field is produced (correct)

What is the direction of the magnetic field lines according to the Right Hand Rule?

The direction of the wrist
The direction of the thumb
The direction of the elbow
The direction of the fingers curling (correct)

What is the shape of the magnetic field lines around a current-carrying wire?

Concentric circles (C) Signup and view all the answers

How do you visualize the magnetic field around a wire from the side?

Circles are seen edge-on (C) Signup and view all the answers

What symbol is used to represent an arrow coming out of the page?

( \odot ) (C) Signup and view all the answers

What happens to the magnetic field near the wire?

It becomes stronger (A) Signup and view all the answers

What is the phenomenon observed when a compass is placed near a current-carrying wire?

The needle is deflected (A) Signup and view all the answers

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

Concentric circles (B) Signup and view all the answers

What is the direction of the magnetic field lines emerging from a current-carrying loop of wire?

Toward the direction of the thumb using the Right Hand Rule (A) Signup and view all the answers

What is the characteristic of the magnetic field inside a solenoid?

Strong and uniform (C) Signup and view all the answers

What is the purpose of an electromagnet?

To generate a magnetic field when an electric current flows through a coil of wire (A) Signup and view all the answers

What is the impact of power lines on the environment?

They can cause bird fatalities due to collisions (C) Signup and view all the answers

What is the frequency of the magnetic fields generated by power lines?

Low frequency (D) Signup and view all the answers

What is the concern regarding the magnetic fields generated by power lines?

They may have long-term effects on humans and the environment (D) Signup and view all the answers

What is the purpose of installing markers on power lines?

To make power lines more visible to birds (D) Signup and view all the answers

What is the relationship between the direction of the current and the direction of the magnetic field lines around a wire?

The magnetic field lines are perpendicular to the direction of the current. (A) Signup and view all the answers

What is the effect of increasing the current through a wire on the magnetic field around the wire?

The magnetic field becomes stronger. (B) Signup and view all the answers

What is the shape of the magnetic field lines around a wire when viewed from above?

Concentric circles. (B) Signup and view all the answers

What is the symbol used to represent an arrow going into the page when visualizing the magnetic field?

( \otimes ) (C) Signup and view all the answers

What is the relationship between the distance from the wire and the strength of the magnetic field?

The magnetic field is weaker at a distance from the wire. (D) Signup and view all the answers

What is the purpose of the Right Hand Rule in relation to magnetic fields?

To determine the direction of the magnetic field. (B) Signup and view all the answers

What happens to the magnetic field lines when viewed from the side?

They appear as edge-on circles. (B) Signup and view all the answers

What is the phenomenon observed when a compass is placed near a wire with no current flowing through it?

The compass needle is not deflected. (D) Signup and view all the answers

What is the pattern formed by the magnetic field lines around a current-carrying loop of wire?

Converging lines with a distinct north and south pole (A) Signup and view all the answers

What is the characteristic of the magnetic field inside a solenoid compared to outside?

Weaker outside (C) Signup and view all the answers

What is the purpose of electromagnets in practical applications?

To maximize the magnetic field strength (B) Signup and view all the answers

What is the impact of power lines on the environment, specifically on certain bird species?

Collision with power lines leading to fatalities (B) Signup and view all the answers

What is the typical frequency of the magnetic fields generated by power lines?

Very low frequency (C) Signup and view all the answers

Why are markers installed on power lines?

To make power lines more visible to birds (D) Signup and view all the answers

What is the concern regarding the long-term effects of exposure to magnetic fields generated by power lines?

Research is ongoing to determine their effects (A) Signup and view all the answers

What determines the strength of the magnetic field generated by an electromagnet?

The current flowing through the coil (D) Signup and view all the answers

What is the primary reason for the formation of a magnetic dipole in a current-carrying loop of wire?

The magnetic field lines converge through the loop. (D) Signup and view all the answers

What happens to the magnetic field strength inside a solenoid when the current increases?

It increases. (A) Signup and view all the answers

Why are electromagnets more versatile than permanent magnets?

The magnetic field strength can be controlled by varying the current. (B) Signup and view all the answers

What is the primary concern regarding the magnetic fields generated by power lines?

They are a threat to certain bird species. (B) Signup and view all the answers

What is the purpose of using the Right Hand Rule for a loop of wire?

To determine the direction of the magnetic field lines. (B) Signup and view all the answers

What is the characteristic of the magnetic field lines outside a solenoid?

They are weaker than inside the solenoid. (C) Signup and view all the answers

What is the effect of the magnetic field generated by power lines on the environment?

It is a significant threat to certain bird species. (D) Signup and view all the answers

What is the ongoing debate regarding the magnetic fields generated by power lines?

Their effect on human health. (A) Signup and view all the answers

What is the relationship between the direction of the magnetic field lines and the direction of the current flow in a wire?

The magnetic field lines are perpendicular to the direction of the current flow. (A) Signup and view all the answers

How do the magnetic field lines change as you move closer to the wire?

The magnetic field lines become stronger and denser. (B) Signup and view all the answers

What is the advantage of using the Right Hand Rule to determine the direction of the magnetic field lines?

It helps you to visualize the magnetic field lines. (D) Signup and view all the answers

What can be inferred about the magnetic field lines around a wire when they are viewed from the side?

The magnetic field lines are edge-on and appear to go into and out of the page. (A) Signup and view all the answers

What is the effect of the magnetic field on a compass placed near a current-carrying wire?

The compass needle is deflected by the magnetic field. (A) Signup and view all the answers

How do the magnetic field lines around a wire change when the current flow is reversed?

The magnetic field lines change direction. (C) Signup and view all the answers

What can be inferred about the magnetic field strength around a wire?

The magnetic field strength is proportional to the current flow. (B) Signup and view all the answers

What is the shape of the magnetic field lines around a current-carrying wire when viewed from above?

The magnetic field lines are circular and concentric around the wire. (A) Signup and view all the answers