# Magnetic Effects of Current and Magnetism-Electric Charge Moving in Magnetic Field (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 1 - 3 of 29

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## Question number: 1

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

MCQ▾

### Question

In the figure the two parallel wires PQ and ST are at 30 cm apart. The currents flowing in the wires are according to figure. The force acting over a length of 5m of the wires is-

(1) 5 x 10 -4 N (2) attraction

(3) 5 x 10 -8 N (4) repulsion

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

### Choices

Choice (4) Response

a.

1 and 3 are correct

b.

1 and 2 are correct

c.

1,2 and 3 are correct

d.

2 and 4 are correct

## Question number: 2

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

Assertion-Reason▾

### Assertion (Ꭺ)

If an electron is not deflected while passing through a certain region of space, then only possibility is that there is no magnetic region.

### Reason (Ꭱ)

Magnetic force is directly proportional to the magnetic field applied.

### Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Ꭺ is true but Ꭱ is false

## Question number: 3

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

Assertion-Reason▾

### Assertion (Ꭺ)

For a charged particle to pass through a uniform electro-magnetic field without change in velocity, its velocity vector must be perpendicular to the magnetic field.

### Reason (Ꭱ)

Net Lorentz force on the particle is given by

### Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are false

c.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

d.

Ꭺ is false but Ꭱ is true

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