Question 1

Which of the following statements about magnetic field lines is correct?

Accepted Answer

Magnetic field lines exit from the north pole and enter at the south pole.

Question 2

A proton moves with velocity $$\vec{v}$$ perpendicular to a uniform magnetic field $$\vec{B}. $$What is the direction of the magnetic force acting on the proton?

Accepted Answer

Perpendicular to both $$\vec{v}$$ and $$\vec{B}$$

Question 3

Which equation gives the magnitude of the force on a charge $$q$$ moving with velocity $$v$$ perpendicular to a magnetic field $$B$$?

Accepted Answer

$$F = qvB$$

Question 4

A charged particle moves in a circle of radius $$r in a $$uniform magnetic field $$B. $$Which equation relates the radius to the particle's mass $$m$$, charge $$q$$, and speed $$v$$?

Accepted Answer

$$r = \frac{mv}{qB}$$

Question 5

A wire of length $$L$$ carries a current $$I$$ perpendicular to a uniform magnetic field $$B. $$What is the magnitude of the force on the wire?

Accepted Answer

$$F = ILB$$

Question 6

A rectangular current loop of area $$A$$ and current $$I is $$placed in a uniform magnetic field $$B. $$What is the maximum torque experienced by the loop?

Accepted Answer

$$	au_{max} = IAB$$

Question 7

Which of the following best describes the motion of a charged particle with velocity at an angle to a uniform magnetic field?

Accepted Answer

It moves in a helical (spiral) path.

Question 8

Ampère’s law relates the magnetic field around a closed loop to which physical quantity?

Accepted Answer

The total current passing through the loop

Question 9

What is the expression for the magnetic field at a distance $$r$$ from a long, straight wire carrying current $$I$$?

Accepted Answer

$$B = \frac{\mu_0$ I}{2\pi r}$$

Question 10

A solenoid has $$N$$ turns, length $$l$$, and carries current $$I. $$What is the magnetic field inside the solenoid?

Accepted Answer

$$B = \mu_0$ \frac{N}{l} I$$

Question 11

Which material exhibits a strong, permanent magnetic field due to the alignment of atomic domains?

Accepted Answer

Ferromagnetic

Question 12

What happens to the domains in a ferromagnetic material when an external magnetic field is applied?

Accepted Answer

They align with the external field.

Question 13

Which of the following is true about the force between two parallel current-carrying wires?

Accepted Answer

The wires attract if the currents are in the same direction.

Question 14

A mass spectrometer separates ions based on which property?

Accepted Answer

Their mass-to-charge ratio

Question 15

Which of the following statements about Earth's magnetic field is correct?

Accepted Answer

The geographic north pole is a magnetic south pole.

Question 16

A paramagnetic material placed in a strong external magnetic field will:

Accepted Answer

Develop a small magnetic field in the direction of the applied field.

Question 17

Which of the following is a correct statement about diamagnetism?

Accepted Answer

Diamagnetic materials develop a small magnetic field opposite to the applied field.

Question 18

A current loop is used in a galvanometer. What physical principle allows the galvanometer to measure current?

Accepted Answer

The loop experiences a torque proportional to the current.

Question 19

Which right-hand rule is used to determine the direction of the magnetic field around a current-carrying wire?

Accepted Answer

Point your thumb in the direction of the current; your fingers curl in the direction of the magnetic field.

Question 20

A charged particle moves parallel to a uniform magnetic field. What is the magnetic force acting on it?

Accepted Answer

Zero

Chapter 22: Magnetism – Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard