23/24 G12 Summative Prep

Which line, A to D, gives correct units for both magnetic flux and magnetic flux density?

• A

• B

• C

• D

Faraday’s law states that an induced emf is proportional to

• The rate of change of the magnetic field

• the rate of change of the electric field

• the rate of change of the magnetic flux

• the rate of change of the electric flux

Which definition is not correct definition of magnetic flux density?

• force per unit length

• force per unit current

• length/current perpendicular to field

• length/current parallel to field

State direction of magnetic field.

• into the page

• out of the page

• to the left

• to the right

What is the force exerted on each electron?

• 2.1 x 10^–14 N

• 1.7 x 10^–14 N

• 1.6 x 10^–14 N

• 1.3 x 10^–14 N

What is the direction of centripetal acceleration at point X?

• Downward

• Inward

• left

• right

The electrons in (b) are replaced with positrons that are moving with speed 3.4 × 107ms^–1 along the same initial path as the electrons. The positrons enter the magnetic field at point X on Fig. 6.1. Which statement is incorrect about the path of positron?

• it moves anticlockwise

• The path is circular path with larger radius

• line enters field at X and leaves field at distance 2d vertically from X

• The path is circular with smaller radius

Calculate the distance d between the path of the electrons

entering the magnetic field and the path of the electrons leaving it. (in m)

• 0.01

• 0.02

• 0.03

• 0.04

The diagram shows a beam of electrons entering a magnetic field. The direction of the magnetic field is out of the page. In what direction does the deflection of the electrons occur?

• Into the page

• Out of the page

• Towards the bottom of the page

• Towards the top of the page

A 6.0 C charge with a mass of 0.20 kg is moving with a speed of 2.5 m/s. It enters into a magnetic field of 3.0 T and begins to move in a circle. What is the radius of curvature of the path the charge follows in this field?

• 45.0 m

• .028 m

• .139 m

• 36 m

Tags

NGSS.HS-PS3-5