Free Printable MAGNETOSTATIC

1.

What is the direction of magnetic field vector due to infinite long straight filament?

a)

Radial

b)

Elliptical

c)

Circular

d)

Parabolic

2.

Which co-ordinate/s serve/s to be a function of magnitude of magnetic field intensity due to infinite long straight filament?

a)

$\Phi$

b)

$0$

c)

$z$

d)

$r$

3.

What is the value of cross product for two similar unit vectors?

a)

zero

b)

$\infty$

c)

a 3rd Vetor

d)

nagative Vetor

4.

According to Biot-Savart law, which parameter/s exhibit/s an/the inverse relationship to the differential magnetic field (dB)?

a)

Current

b)

Magnitude of differential length

c)

Sine of angle between filament & line connecting differential length to point

d)

Square of the distance from differential element to point

5.

What does the constant 'μ' indicate, while specifying the relation between magnetic flux density (B) and magnetic field intensity (H)?

a)

Persistivity

b)

Permittivity

c)

Permissibility

d)

Permeability

6.

Find the total flux in a coil of magnetic flux density 12 units and area 7 units.

a)

0.84

b)

0.96

c)

8.4

d)

9.6

7.

The permeability of air or free space is -------

a)

$0$

b)

$\infty$

c)

$4\pi\times10^{-7}$ $NA^{-2}$

d)

$8.852\times10^{-12}$ $Fm^{-1}$

8.

Basic source of magnetism ______________.

a)

Charged particles alone

b)

Movement of charged particles

c)

Magnetic dipoles

d)

Magnetic domains

9.

Units for magnetic flux density

a)

$Wb$ / $m^2$

b)

Wb / A.m

c)

A / m

d)

Tesla / m

10.

Find the force on the straight conductor of length .30 m carrying a current of

5 .0 A in the – k direction where the magnetic Field is given by

B=3.5 ×10^-3 (i - j) T

a)

4\times10^{-3}\ \frac{\left(-i-j\right)}{\sqrt{2}}N

b)

$4\times10^{-3}\ \frac{\left(i-j\right)}{\sqrt{2}}N$

c)

$7.42\times10^{-3}\ \frac{\left(-i-j\right)}{\sqrt{2}}N$

d)

$74.2\times10^{-3}\ \frac{\left(-i-j\right)}{\sqrt{2}}N$

11.

A charged particle whose mass is 19.9 ×10^-27 kg and charge is 1.6×10^-19 C moves with a speed of 3×10⁵ m/s at right angle to a

magnetic field of 0 .75 T.

What is the force acting on the charge, centripetal acceleration and radius of the circle in which charged particle moves

a)

3.6×10^-14N,1.81×10¹² m/s², 49.7×10^-3 m

b)

3.0×10^-14N,1.81×10¹² m/s², 49.7×10^-3 m

c)

3.0×10^-14N,1.8×10¹² m/s², 49.7×10^-3 mm

d)

36 ×10^-14N,1.81×10¹² m/s², 4.97×10^-3 m

12.

Four Particles P₁(proton), P₂(electron), P₃(alpha), P₄(neutron) enters a region of constant magnetic field with same velocities. The magnetic field is perpendicular to the velocity.

Which particle move in a circular path of maximum radius?

a)

P₁

b)

P₂

c)

P₃

d)

P₄

13.

A long wire is bent as shown in figure. Find the magnitude and direction of the magnetic field at the center of the circular part if a current of I amp is passed through the wire

The different parts of the wire do not touch each other at Q.

a)

\frac{\mu_0}{2a}\ \left(\frac{1}{\pi}-1\right),\ directed\ upwards\ to\ the\ plane\ ofthe\ page

b)

$\frac{\mu_0}{2a}\ \left(\frac{1}{\pi}+1\right),\ directed\ upwards\ to\ the\ plane\ ofthe\ page.$

c)

$\frac{\mu_0}{a}\ \left(\frac{1}{\pi}-1\right),\ directed\ upwards\ to\ the\ plane\ ofthe\ page.$

d)

$\frac{\mu_0}{a}\ \left(\frac{1}{\pi}+1\right),\ directed\ upwards\ to\ the\ plane\ ofthe\ page.$

14.

A charged particle of mass m and charge q moves with a constant velocity along the positive x direction
v=a i.
It enters a region of Magnetic field which is directed towards positive z direction from x=a which is given by
B = b k
Find the initial acceleration of the particle?

a)

$a=\left(-\frac{qab}{m}\right)\ j^{ }$

b)

$a=\left(-\frac{qa}{bm}\right)\ j^{ }$

c)

$a=\left(-\frac{qb}{am}\right)\ j^{ }$

d)

$a=\left(-\frac{q}{abm}\right)\ j^{ }$

15.

Which of the following is true about the motion of the particle?

a)

Force will always be perpendicular to the velocity

b)

The magnitude of the velocity remains constant

c)

KE of the particle remains constants

d)

All are true

16.

Expression for the velocity of the particle in a cyclotron.

a)

$v=\sqrt{\frac{2qE_0a}{m}}$

b)

$v=\sqrt{\frac{2qB_0a}{m}}$

c)

$v=\sqrt{\frac{2qE_0a}{B_0m}}$

d)

$v=\sqrt{\frac{2qB_0a}{E_0m}}$

17.

In a cyclotron, a charged particle

a)

speeds up between the dees because of the magnetic field.

b)

speeds up in a dee.

c)

slows down within a dee and speeds up between dees

d)

while going from one dee to another due to electric field.

18.

Which of the following is true?

a)

Magnetic field exerts force only a stationary charge.

b)

Electric field exerts force on both stationary and moving charge

c)

Magnetic field exerts force on charge moving parallel to the direction of the field

d)

All of the above

19.

$\nabla.B$ is

a)

$0$

b)

$\infty$

c)

$\mu_0J$

d)

$\mu_0I$

20.

The unit of Surface current density (K) is

a)

$\frac{A}{m}$

b)

$\frac{A}{m^2}$

c)

$Am^2$

d)

$Am$

21.

The unit of Surface current density (K) is

a)

$\frac{A}{m}$

b)

$\frac{A}{m^2}$

c)

$Am^2$

d)

$Am$

MAGNETOSTATIC

Total questions: 21

Worksheet time: 11mins

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