HSC Electromagnetism 6.1,6.2,6.3,6.4

Two parallel plates are 1 mm apart. A potential difference of 100V is applied. what is the magnitude of the uniform electric field between the plates?

• 10^-3 V/m

• 10^-1 V/m

• 10² V/m

• 10⁵ V/m

A charged non-magnetic particle is moving in a magnetic field. Which would NOT affect the magnetic force on the particle?

• the strength of the magnetic field

• the magnitude of the charge on the particle

• the velocity component parallel to the magnetic field direction

• the velocity component perpendicular to the magnetic field direction

An electron is moving near a long straight wire. When a current is applied to the wire the electron experiences a force in the same direction as the current flow. What was the electron's initial direction of motion?

• Parallel to the current direction

• Opposite to the current direction

• Towards the wire and perpendicular to it

• Away from the wire and perpendicular to it

An electron in a magnetic field of 2.1x10^-2 T moves in a circular path with a speed of 4.9 x10⁶m/s. After one orbit under the influence of this magnetic field, how much energy does the electron gain?

• 0 J

• 1.2 x 10^-17 J

• 1.56 x 10^-14 J

• 7.84 x 10¹³ J

An electron passes through a uniform magnetic field at right angles to the direction of the field at a speed of 4 x 10⁶ m/s. The intensity of the field is 0.50T. What is the magnitude of the force acting on the electron?

• zero

• 2.0 x 10^-6 N

• 3.2 x 10^-13 N

• 6.4 x 10¹³ N

A region of space contains a constant magnetic field and a constant electric field. How ill these fields affect an electron that is stationary in the field?

• Both fields will evert a force

• Neither field will exert a force

• Only the electric field will exert a force

• Only the magnetic field will exert a force

Two long parallel wires carry equal currents in the same direction. The magnitude of the Force between the wires due to the currents is F. The separation between the wires is doubled. What is the force now? (same current)

• F/2 and attractive

• F/2 and repulsive

• F/4 and attractive

• F/4 and repulsive

A circular coil of wire with diam 5cm is placed so that the plane is at right angles to a magnetic field of flux density 3x10^-3T. The coil is rotated so that its plane is parallel to the magnetic field. ? magnitude of change in flux

• 5.9 x 10^-6 Wb

• 1.2 x 10^-5 Wb

• 2.4 x 10^-5 Wb

• 4.7 x 10^-5 Wb

What is essential equipment for the operation of a step-down transformer?

• A laminated iron core

• A non-conducting core

• A magnetic interaction between the primary and secondary coils

• An electrical interaction between the primary and secondary coils

Which law best applies to the operation of an electrical transformer?

• Conservation of Mass

• Conservation of Energy

• Conservation of Charge

• Conservation of Momentum