# Electromagnetic Induction & Alternating Currents (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 39 - 43 of 124

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## Passage

In the figure shown, the rod has a resistance R, the horizontal rails have negligible friction. Magnetic field of intensity B is directed perpendicular into the plane of paper. A cell of e. m. f. E and negligible internal resistance is connected between points a and b. The rod is initially at rest.

## Question number: 39 (3 of 3 Based on Passage) Show Passage

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

MCQ▾

### Question

The velocity of the rod as a function of time t (where ) is

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 40

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

### Question

In an L - R circuit, the value of L is henry and the value of R is 30 ohm. If in the circuit, an alternating e. m. f. of 200 volt at 50 cycles per sec is connected, the impedance of the circuit and current will be

### Choices

Choice (4) Response

a.

40.4 Ω, 5A

b.

30.7 Ω, 6.5A

c.

11.4Ω, 17.5A

d.

50 Ω, 4A

## Question number: 41

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

### Question

In the circuit, E = 10 volt, R1 = 5.0 ohm, R 2 = 10 ohm and L = 5.0 henry. The current just after the switch S is pressed is.

### Choices

Choice (4) Response

a.

3.0A

b.

5.0A

c.

2.0A

d.

6.0A

## Question number: 42

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

### Question

An alternating current of frequency is flowing in a circuit containing a resistor of resistance R and a choke of inductance L in series. The impedance of this circuit is

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 43

» Electromagnetic Induction & Alternating Currents » Alternating Currents

Assertion-Reason▾

### Assertion (Ꭺ)

The alternating current lags behind the emf by a phase angle of , when ac flows through an inductor.

### Reason (Ꭱ)

The inductive reactance increases as the frequency of ac source decreases.

### Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is true but Ꭱ is false

c.

Ꭺ is false but Ꭱ is true

d.

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

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