# Electromagnetic Induction & Alternating Currents (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 12 - 15 of 124

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## Question number: 12

» Electromagnetic Induction & Alternating Currents » Lenz's Law

MCQ▾

### Question

An electron moves along the line AB, which lies in the same plane as a circular loop of conducting wires as shown in the diagram. What will be the direction of current induced if any, in the loop?

### Choices

Choice (4) Response

a.

The current will be anticlockwise

b.

No current will be induced

c.

The current will change direction as the electron passes by

d.

The current will be clockwise

## Question number: 13

» Electromagnetic Induction & Alternating Currents » Faraday's Law

MCQ▾

### Question

An airplane having a distance of 50 meter between the edges of its wings is flying horizontally with a speed of 360km/hour. If the vertical component of earth’s magnetic field is 4 x 10 -4 weber/m 2, then the induced emf between the edges of its wings will be -

### Choices

Choice (4) Response

a.

2 V

b.

0.2 V

c.

2 mV

d.

20 V

## Question number: 14

» Electromagnetic Induction & Alternating Currents » Faraday's Law

MCQ▾

### Question

The magnetic flux passing perpendicular to the plane of the coil and directed into the paper is varying according to the relation , where is in milli-weber and t is in second. Then the magnitude of emf induced in the loop when t = 2 second is-

### Choices

Choice (4) Response

a.

19 mV

b.

31 mV

c.

-14 mV

d.

-6 mV

## Question number: 15

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

Assertion-Reason▾

### Assertion (Ꭺ)

Soft iron is used as a core of transformer.

### Reason (Ꭱ)

Area of hysteresis loop for soft iron is small.

### Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is true but Ꭱ is false

c.

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

d.

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

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