NEET Physics: Questions 548 - 551 of 2098

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Question number: 548

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

MCQ▾

Question

A loop of wire is placed in a magnetic field B = 0.02i T. Then the flux through the loop if its area vector A=(30i^+16j^+23k^)cm2 is

Choices

Choice (4) Response

a.

60 μ Wb

b.

46 μ Wb

c.

32 μ Wb

d.

138 μ Wb

Question number: 549

» Magnetic Effects of Current and Magnetism » Ampere's Law

Assertion-Reason▾

Assertion (Ꭺ)

If two long wires, hanging freely are connected to a battery in series, they come closer to each other.

Reason (Ꭱ)

Force of repulsion acts between the two wires carrying current.

Choices

Choice (4) Response

a.

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

b.

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

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are false

Question number: 550

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

MCQ▾

Question

The distance between the ends of wings of an airplane is 3m. This airplane is descending down with a speed of 300 km/hour. If the horizontal component of earth’s magnetic field is 0.4 gauss then the value of e. m. f. induced in the wings of the plane will be –

Choices

Choice (4) Response

a.

0.01 V

b.

2 V

c.

0.1 V

d.

1 V

Question number: 551

» Electromagnetic Induction & Alternating Currents » Lenz's Law

MCQ▾

Question

Two identical coaxial circular loops carry current i each circulating in the clockwise direction. If the loops are approaching each other, then

Choices

Choice (4) Response

a.

Current in each loop remains the same

b.

Current in each loop decreases

c.

Current in each loop increases

d.

Current in one-loop increases and in the other it decreases

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