Options:
- A. (F1+F2) (121+122)
- B. (F1+F2) (122-112)
- C. (F1+F2) (12-11)
- D. (F1+F2) (12-11)
View Answer
C. (F1+F2) (12-11)
Physics
A magnetic field___________________?
Options:
- A. always exerts a force on a charged particle
- B. never exerts a force on a charged particles
- C. exerts a force if the charged particle is moving in the direction of the magnetic field lines
- D. exerts a force if the charged particle is moving perpendicular to the magnetic field lines
View Answer
D. exerts a force if the charged particle is moving perpendicular to the magnetic field lines
A current carrying conductor is placed in a uniform magnetic field parallel to it. The magnetic force experienced by the conductor is _____________________?
Options:
- A. F=1/B
- B. F=1/Bsin?
- C. F/0
- D. F=1/Bcos?
View Answer
C. F/0
Heating a magnet will ____________________?
Options:
- A. weaken it
- B. strengthen it
- C. reverse its polarity
- D. demagnetize it completely
View Answer
A. weaken it
pure resistor circuit the voltage and current are_______________?
Options:
- A. Lagging each other
- B. They are at 90? phase difference
- C. They have zero phase difference
- D. No phase difference
View Answer
C. They have zero phase difference
The phase angle between the voltage and the current in an AC circuit consisting of a resistance is______________?
Options:
- A. Zero
- B. 45
- C. 90
- D. 180
View Answer
A. Zero
Which of the following pairs does not have identical dimensions ?
Options:
- A. Torque and energy
- B. Momentum and impulse
- C. Energy and work
- D. Mass and moment of inertia
View Answer
D. Mass and moment of inertia
If east, west, north, south, up and down are representing the direction of unit vectors, then east x south has the direction along_____________?
Options:
- A. West
- B. North
- C. Down
- D. Up
View Answer
C. Down
For chain reaction to build up the size of the radioactive target should be______________?
Options:
- A. Greater than the critical size
- B. Less than the critical size
- C. Equal to the critical size
- D. All of above can build up a change reaction
View Answer
A. Greater than the critical size
The charge on an electron was determine by ________________?
Options:
- A. Ampere
- B. Maxwell
- C. Millikan
- D. Thomson
View Answer
C. Millikan