Contents

- 1 What does a moving charge experience when it is near a magnetic field a stationary charge a force static friction gravity?
- 2 Is moving charge affected by magnetic field?
- 3 Why does a moving charge experience a force when placed in a magnetic field?
- 4 How does a moving charge create a magnetic field?
- 5 What is the direction of the magnetic force on a positive charge?
- 6 What is the work done by magnetic field on a moving charge and why?
- 7 Does magnetic force depend on sign of charge?
- 8 Why magnetic field does no work on moving charge?
- 9 Is the work required to accelerate a rod from rest to a speed v in a magnetic field greater than the final kinetic energy of the rod Why?
- 10 Which statement best describes magnetic fields?
- 11 What must be true about a charged particle for it to feel a force from a magnetic field?
- 12 Which statement about the force on a charged particle placed in a magnetic field is true?
- 13 How many ways are there to change the strength of a magnetic field?
- 14 What is the biggest magnet we know of?
- 15 What kind of magnet can be turned on and off?

## What does a moving charge experience when it is near a magnetic field a stationary charge a force static friction gravity?

Explanation: A **moving charge** is just like a wire carrying electricity. When a wire caryying electricity is placed with in the vicinity of a **magnetic field** it **experience** a **force** on it. Like wise a **moving charge** with in a **magnetic field near** by feels a **force** on it and thus it changes its direction of **motion**.

## Is moving charge affected by magnetic field?

**Magnetic fields** exert forces on **moving charges**. The direction of the **magnetic** force on a **moving charge** is perpendicular to the plane formed by v and B and follows right hand rule–1 (RHR-1) as shown. The magnitude of the force is proportional to q, v, B, and the sine of the angle between v and B.

## Why does a moving charge experience a force when placed in a magnetic field?

This **force** on the **charged** particle is always perpendicular to the direction it is **moving**. Thus **magnetic forces** cause **charged** particles to change their direction of **motion**, but they **do** not change the speed of the particle.

## How does a moving charge create a magnetic field?

As Ampere suggested, a **magnetic field** is produced whenever an electrical **charge** is in motion. The spinning and orbiting of the nucleus of an atom produces a **magnetic field** as **does** electrical current flowing through a wire. The direction of the spin and orbit determine the direction of the **magnetic field**.

## What is the direction of the magnetic force on a positive charge?

Key Points

The right hand rule states that, to find the **direction of the magnetic force on a positive** moving **charge**, the thumb of the right hand point in the **direction** of v, the fingers in the **direction** of B, and the **force** (F) is directed perpendicular to the right hand palm.

## What is the work done by magnetic field on a moving charge and why?

Complete step by step answer:

Since the **moving charge** produces a **magnetic field**, hence if an external **magnetic field** is applied, the **moving charge** will interact with the **field** and hence it experiences a force or **magnetic** force. This force is given by F=q(→v×→B). Thus force is perpendicular to velocity.

## Does magnetic force depend on sign of charge?

1) **depends** on the **sign** of the **charge** on the particle. 3) **depends** on the **magnetic** field at the particle’s instantaneous position. 4) is at right angles to both the velocity and the direction of the **magnetic** field.

## Why magnetic field does no work on moving charge?

**Magnetic** force is always perpendicular to velocity, so that it **does no work** on the **charged** particle. The particle’s kinetic energy and speed thus remain constant. The direction of motion is affected, but not the speed.

## Is the work required to accelerate a rod from rest to a speed v in a magnetic field greater than the final kinetic energy of the rod Why?

**Is the work required to accelerate a rod from rest to a speed v in a magnetic field greater than the final kinetic energy of the rod**? The **work** is **greater than** the **kinetic energy** because it takes **energy** to counteract the induced emf. The copper sheet shown below is partially in a **magnetic field**.

## Which statement best describes magnetic fields?

The correct answers are “A **magnetic field** is the area around a **magnet** where a force is exerted on certain objects”, “**Magnetic field** lines spread out of the north end of the **magnet**” and “**Magnetic fields** are three-dimensional and resemble a bubble”.

## What must be true about a charged particle for it to feel a force from a magnetic field?

A **charged particle** experiences a **force** when moving through a **magnetic field**. If the **field** is in a vacuum, the **magnetic field** is the dominant factor determining the motion. Since the **magnetic force** is perpendicular to the direction of travel, a **charged particle** follows a curved path in a **magnetic field**.

## Which statement about the force on a charged particle placed in a magnetic field is true?

A **magnetic force** is exerted only if the **particle** is moving. A **magnetic field** always exerts a **force on a charged particle**. The **force** causes the **particle** to gain kinetic energy.

## How many ways are there to change the strength of a magnetic field?

You can increase the current in 3 **different ways**: (1) you can increase the **strength** of the **magnetic field** (that is, get yourself a stronger **magnet**); (2) you can spin the loop faster and faster; or (3) you can wind the wire into a coil with multiple loops.

## What is the biggest magnet we know of?

The **biggest magnet** on the planet is the earth itself. The earth consists of a relatively shallow crust atop a thick, rocky mantle. Under the mantle is a dense core of liquid metal (mostly iron) surrounding a solid-metal center.

## What kind of magnet can be turned on and off?

An **electromagnet** is a magnet that works with electricity. It can be switched on and off. The coils are nearly always made of **copper** wire because **copper** is such an excellent electrical conductor.