Phys 1260- Exam 2 Questions and
Correct Answers
When a charge occurs in the magnetic field in a closed loop of wire...
- ANSWER- All of these
-Electromagnetic induction occurs
-A voltage is induced in the wire
-A current is created in the loop of wire
When a magnet is moved to and fro in a wire coil, voltage is induced. If the coil has
twice as many loops, the voltage induced is
- ANSWER- twice
When current reverses direction in a wire, the surrounding magnetic field
- ANSWER- also reverses direction
When two identical lamps in a circuit are connected in parallel, the total resistance is
- ANSWER- less than the resistance of either lamp.
When two lamps are connected in parallel to a battery, the electrical resistance that the
battery "senses" is
- ANSWER- Less than the resistance of either lamp
When two lamps are connected in series to a battery, the electrical resistance that the
battery "senses" is
- ANSWER- More than the resistance of either lamp
Where magnetic field lines are more dense, the field there is
, - ANSWER- stronger
Whereas electric charges can be isolated, magnetic poles
- ANSWER- cannot
A beam of singly-charged ions entering a magnetic field are swept into circular paths.
The wider paths are those of - ANSWER- the heavier ions
A motor and a generator are - ANSWER- similar devices
A weak and strong magnet repel each other. The greater repelling force is by the
- ANSWER- both the same
An electromagnet can be made stronger by:
- ANSWER- Both A and B
A. Increasing the number of turns of wire
B. Increasing the current in the coil
At rate at which energy is transferred is - ANSWER- power
Compared to the huge force that attracts an iron tack to a strong magnet, the force that
the tack exerts on the magnet is
- ANSWER- equally huge
Consider a lamp powered by a battery. Charge flows
- ANSWER- through both the battery and the lamp
Electromagnetic induction occurs in a coil when there is a change in
- ANSWER- Magnetic field intensity in the coil
Correct Answers
When a charge occurs in the magnetic field in a closed loop of wire...
- ANSWER- All of these
-Electromagnetic induction occurs
-A voltage is induced in the wire
-A current is created in the loop of wire
When a magnet is moved to and fro in a wire coil, voltage is induced. If the coil has
twice as many loops, the voltage induced is
- ANSWER- twice
When current reverses direction in a wire, the surrounding magnetic field
- ANSWER- also reverses direction
When two identical lamps in a circuit are connected in parallel, the total resistance is
- ANSWER- less than the resistance of either lamp.
When two lamps are connected in parallel to a battery, the electrical resistance that the
battery "senses" is
- ANSWER- Less than the resistance of either lamp
When two lamps are connected in series to a battery, the electrical resistance that the
battery "senses" is
- ANSWER- More than the resistance of either lamp
Where magnetic field lines are more dense, the field there is
, - ANSWER- stronger
Whereas electric charges can be isolated, magnetic poles
- ANSWER- cannot
A beam of singly-charged ions entering a magnetic field are swept into circular paths.
The wider paths are those of - ANSWER- the heavier ions
A motor and a generator are - ANSWER- similar devices
A weak and strong magnet repel each other. The greater repelling force is by the
- ANSWER- both the same
An electromagnet can be made stronger by:
- ANSWER- Both A and B
A. Increasing the number of turns of wire
B. Increasing the current in the coil
At rate at which energy is transferred is - ANSWER- power
Compared to the huge force that attracts an iron tack to a strong magnet, the force that
the tack exerts on the magnet is
- ANSWER- equally huge
Consider a lamp powered by a battery. Charge flows
- ANSWER- through both the battery and the lamp
Electromagnetic induction occurs in a coil when there is a change in
- ANSWER- Magnetic field intensity in the coil
