Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 4

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Weekly Quiz Competition

Question 1
4 / -1

The magnetic field at the centre of a current carrying circular loop is B. If the radius of the loop is doubled, keeping the current same, the magnetic field at the centre of the loop would be

A

B

C
2B

D
4B

Solution
Question 2
4 / -1

Two long parallel conductors carry currents in opposite directions as shown. One conductor carries a current of 10 A and the distance between the wires is d =10 cm. Current I is adjusted, so that the magnetic field at P is zero. P is at a distance of 5 cm to the right of the 10 A current. Value of I is

A
40 A

B
30 A

C
20 A

D
10 A

Solution
Question 3
4 / -1

A wire in the form of a circular loop of one turn carrying a current produces a magnetic field B at the centre. If the same wire is looped into a coil of two turns and carries the same current, the new value of magnetic induction at the centre is

A
3B

B
5B

C
4B

D
2B

Solution
Question 4
4 / -1

For the magnetic field to be maximum due to a small element of current carrying conductor at a point, the angle between the element and the line joining the element to the given point must be

A
0°

B
90°

C
180°

D
45°

Solution
Question 5
4 / -1

A narrow beam of protons and deuterons, each having the same momentum, enters a region of uniform magnetic field directed perpendicular to their direction of momentum. The ratio of the radii of the circular paths described by them is

A
1 : 2

B
1 : 1

C
2 : 1

D
1 : 3

Solution
Question 6
4 / -1

A proton and an a-particle, accelerated through the same potential difference, enter a region of uniform magnetic field normally. If the radius of the proton orbit is 10 cm, then radius of a-particle is

A
10 cm

B
10√2 cm

C
20 cm

D
5√2 cm

Solution
Question 7
4 / -1

An electron moves at right angle to a magnetic field of 5 × 10^-2 T with a speed of 6 × 10⁷ m/s. If the specific charge of the electron is 1.7 × 10¹¹ C/kg. The radius of the circular path will be

A
2.9 cm

B
3.9 cm

C
2.35 cm

D
2 cm

Solution
Question 8
4 / -1

A charged particle experiences magnetic force in the presence of magnetic field. Which of the following statements is correct?

A
The particle is moving and magnetic field is perpendicular to the velocity

B
The particle is moving and magnetic field is parallel to the velocity

C
The particle is stationary and magnetic field is perpendicular

D
The particle is stationary and magnetic field is parallel
Question 9
4 / -1

If a velocity has both perpendicular and parallel components while moving through a magnetic field, what is the path followed by a charged particle?

A
Circular

B
Elliptical

C
Linear

D
Helical
Question 10
4 / -1

A cyclotron is operated at an oscillator frequency of 24 MHz and has a dee radius of 60 cm. Find the magnitude of the magnetic field needed for deuterons to be accelerated in the cyclotron

A
6.4 T

B
3.2 T

C
1.6 T

D
0.9 T

Solution