Magnetic force Quiz 1

Question 1

Meenu was analyzing a charged particle with a mass $$4	imes {{10}^{-12}}	ext{ kg}$$ and having the charge mentioned as $$	ext{2e}$$.  The particle was moving in a circular orbit with radius $$	ext{0}	ext{.63 }nm$$ and centripetal acceleration is given as $$2	imes {{10}^{-3}}	ext{ m}{{	ext{s}}^{-2}}$$. Calculate the magnetic field existing in this region.

Accepted Answer

$$2.232	imes {{10}^{10}}	ext{ }T$$

Answer

$$5	imes {{10}^{5}}	ext{ }T$$

Answer

$$3.4	imes {{10}^{15}}	ext{ }T$$

Answer

None of the above

Question 2

What does a student do if he tries to move a charge through a magnetic field without doing any work?

Accepted Answer

Move the charge perpendicular to the field

Answer

Move the charge parallel to the field

Answer

Move the charge anti-parallel to the field

Answer

None of the above

Question 3

The Field of magnetic vector $$\overset{	o }{\mathop{B}}\,$$ is always

Accepted Answer

solenoidal

Answer

irritational

Answer

Non-Solenoidal

Answer

Both $$(a)$$ and $$(c)$$

Question 4

In a uniform magnetic field of 2 Tesla, a proton beam travels at a speed of $$3	imes {{10}^{5}}m{{s}^{-1}}$$ Find the force on the proton if the proton beam and magnetic field make an angle of $${{30}^{\circ }}$$. $$	ext{(Charge on proton: }1.6	imes {{10}^{-19}}C)$$

Accepted Answer

$$4.8	imes {{10}^{-14}}N$$

Answer

$$7.2	imes {{10}^{-14}}N$$

Answer

$$3.2	imes {{10}^{-14}}N$$

Answer

$$2.8	imes {{10}^{-14}}N$$

Question 5

Four particles, Electron, Proton, $$H{{e}^{+}}$$and $$L{{i}^{+}}$$ are projected in a circular orbit of same radius perpendicular to a given magnetic field. The velocity will be smallest for

Accepted Answer

$$L{{i}^{+}}$$

Answer

electron

Answer

Proton

Answer

$$H{{e}^{+}}$$