Physics
Grade-10
Easy
Question
A magnetic field exerts no force on
- An electric charge moving perpendicular to its direction
- An unmagnetized iron bar
- A stationary electric charge
- A magnet
Hint:
- The force exerted on a charged particle is given by the Lorentz equation which is as follows
-
F=qvBsinθ
F=qvBsinθ
The correct answer is: A stationary electric charge
- The force exerted on a charged particle is given by the Lorentz equation which is as follows
-
F=qvBsinθ
-
Hence the force experienced will be zero if any of the terms in the above equation is zero. The force experienced will be zero if the charge on the particle is zero, that is, the particle is uncharged or if the velocity of the particle is zero, that is the particle is at rest. The force experienced is zero when the angle between the velocity of the charge and the magnetic flux is zero.
-
Now analysing the given options, we can say that a magnetic field exerts no force on a stationary charge.
F=qvBsinθ
Hence the force experienced will be zero if any of the terms in the above equation is zero. The force experienced will be zero if the charge on the particle is zero, that is, the particle is uncharged or if the velocity of the particle is zero, that is the particle is at rest. The force experienced is zero when the angle between the velocity of the charge and the magnetic flux is zero.
Now analysing the given options, we can say that a magnetic field exerts no force on a stationary charge.
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