Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 18

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

Two concentric coils each of radius equal to 2π cm are placed at right angles to each other. 3 A and 4 A are the currents flowing in each coil respectively. The magnetic induction in Wbm ^-2 at the centre of the coils will be (10 = 4π × 10^-7 WbAm ^-1)

A
12 × 10^-5

B
10^-5

C
5 × 10^-5

D
7 × 10^-5

Solution
Question 2
4 / -1

A wire shown in figure carries a current of 40 A. If r = 3.14 cm, the magnetic field at point P will be

A
1.6 × 10^-3 T

B
3.2 × 10^-2 T

C
4.8 × 10^-3 T

D
6.0 × 10^-4 T

Solution
Question 3
4 / -1

A
3 : 1

B
5 : 1

C
9 : 1

D
4 : 3

Solution
Question 4
4 / -1

A solenoid of length 1.0 m has a radius of 1 cm and has a total of 1000 turn wound on it. It carries a current of 5 A. If an electron were to move with a speed of 10⁴ ms ^-1 along the axis of the current carrying solenoid the force experienced by this electron is

A
2 N

B
1.2 N

C
zero

D
2.5 N

Solution
Question 5
4 / -1

A proton of mass m and charge q is moving in a plane with kinetic energy E. If there exists a uniform magnetic field B, perpendicular to the plane of the motion, the proton will move in a circular path of radius

A

B

C

D

Solution
Question 6
4 / -1

A stream of electrons and protons are directed towards a narrow slit in a screen (see figure). The intervening region has a uniform electric field E (vertically downwards) and a uniform magnetic field B (out of the plan of the figure) as shown. Then,

A

B

C
neither electrons nor protons will go through the slit irrespective of their speed

D
electrons will always be deflected upwards irrespective of their speed
Question 7
4 / -1

A
If θ = 0°, the charge moves in a circular path in the x-z plane

B
If θ = 0°, the charge undergoes helical motion with constant pitch along the y-axis

C
If θ = 10°, the charge undergoes helical motion with its pitch increasing with time, along the y-axis

D
If θ = 70°, the charge undergoes linear but accelerated motion along the y-axis
Question 8
4 / -1

A proton is moving in a uniform magnetic field B in a circular path of radius a in a direction perpendicular to z-axis along which field B exists. Calculate the angular momentum, if the radius a and charge on proton is e.

A

B
eB² a

C
a² eB

D
aeB

Solution
Question 9
4 / -1

An electron having charge 16 × 10 ^-19 C and mass 9 × 10^-31 kg is moving with speed 4 × 10 ⁶ ms ^-1 in a magnetic field of 2 × 10 ^-1 Tin a circular orbit. The force acting on electron and the radius of the circular orbit will be

A
18.8 × 10^-13 N, 1.1 × 10^-4 m

B
12.8 × 10^-14 N, 1.1 × 10^-3 m

C
12.8 × 10^-13 N, 1.1 × 10^-3 m

D
1.28 × 10^-13 N, 1.1 × 10^-4 m

Solution
Question 10
4 / -1

A proton with energy of 2 MeV enters a uniform magnetic field of 2.5 T normally. The magnetic force on the proton is (take, mass of proton to be 1.6 × 10^-27 kg)

A
3 × 10^-12 N

B
8 × 10^-10 N

C
8 × 10^-12 N

D
2 × 10^-10 N

Solution