[13] A magnetic field exerts a force on all the following EXCEPT (a) a current c

Question

[13] A magnetic field exerts a force on all the following EXCEPT

(a) a current carrying wire (b) a magnet (c) a moving electric charge

(d) a stationary electric charge

[14] One of the differences between electric and magnetic fields is that

(a) electric fields do not exert a force on magnets.
(b) magnetic fields created by one pole are common.
(c) magnetic fields exert no force on moving electric charges.

(d) breaking apart an electric dipole (+ & - charges) creates new dipoles rather than isolated charges.

[15] Magnetic field lines
(a) end on magnetic poles. (b) trail behind moving charges.
(c) are always perpendicular to electric field lines. (d) close without ending.

[16] The magnetic field produced by a tightly wound toroid
(a) is a uniform field (b) is four times that produced by a hemiroid. (c) is zero outside the toroid. (d) falls off as 1/r outside the toroid.

[17] A coil produces a uniform magnetic field. This means the coil must be a
(a) solenoid. (b) toroid. (c) flat, multiturn coil. (d) square loop.

[18] Material A is weakly repelled by a magnetic field while material B is weakly attracted by a magnetic field. Which of the following correctly describes materials A and B?
a) A is diamagnetic while B is paramagnetic, having a few unpaired electrons.
b) A is paramagnetic while B is diamagnetic, having a few unpaired electrons.

c) A may be paramagnetic or diamagnetic while B is ferromagnetic. d) None of the above.

Explanation / Answer

Question 13) answer) option d)

Reason : force acting on a moving charge (F) = qvBsin(©)

For an stationary charge , v = 0 ( velocity = 0)

So, F = q*(0)*B*sin(©) = 0

Therefore magnetic force = 0

Magnetic force exerted on a current carrying wire

F = ilBsin(©) and also magnetic force acts on a magnet

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