# Magnetic Effects of Current and Magnetism (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 30 - 33 of 155

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## Question number: 30

» Magnetic Effects of Current and Magnetism » Electric Charge Moving in Magnetic Field

MCQ▾

### Question

A beam of protons enters a uniform magnetic field of 0.3 tesla with a velocity of 4 x 10 5 m/s at an angle of 60° to the field. Then, (Mass of the proton = 1.7 x 10 -27 kg. )

(1) The radius of the helical path is 1.226 x 10 -2 m

(2) The pitch of the helix is 4.45 x 10 -2 m

(3) The radius of the helical path is 1.226 x 10 -3 m

(4) The pitch of the helix is 4.45 x 10 -4 m

Select the correct answers and mark it according to the following codes:

### Choices

Choice (4) Response

a.

1,2 and 3 are correct

b.

1 and 2 are correct

c.

2 and 4 are correct

d.

1 and 3 are correct

## Question number: 31

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

### Question

The force experienced by a pole of strength 100 Am at a distance of 0.2 m from a short magnet of length 5 cm and pole strength of 200 Am on its axial line will be

### Choices

Choice (4) Response

a.

2.5 x 10 -3 N

b.

5.0 x 10 -3 N

c.

5.0 x 10 -2 N

d.

2.5 x 10 -2 N

## Question number: 32

» Magnetic Effects of Current and Magnetism » Electric Charge Moving in Magnetic Field

MCQ▾

### Question

A proton is to circulate the earth along the equator with a speed of 1.0 x 10 7 m/s. The minimum magnetic field which should be created at the equator for this purpose. (The mass of proton = 1.7 x 10 -27 kg and radius of earth = 6.37 x 10 6 m) magnetic field will be (in Wb/m 2)

### Choices

Choice (4) Response

a.

2 x 10 -7

b.

1.0 x 10 -7

c.

1.67 x 10 -8

d.

1.6 x 10 -19

## Question number: 33

» Magnetic Effects of Current and Magnetism » Current Loop as Magnetic Dipole

MCQ▾

### Question

A thin circular wire carrying a current I has a magnetic moment M. The shape of the wire is changed to a square and it carries the same current. It will have a magnetic moment

### Choices

Choice (4) Response

a.

b.

c.

d.

M

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