Magnetic flux Quiz 1

Question 1

Induced emf is more for <img  src="https://cmds-vedantu.s3.ap-southeast-1.amazonaws.com/prod/question-sets/23495f06-091e-476b-993a-13025e9cec925282082841121946682.png"/>

Accepted Answer

Case $$2$$

Answer

Case $$1$$

Answer

Same in both

Answer

All are correct

Question 2

As viewed from the left, the current flows in an anti-clockwise direction. A battery attached to a solenoid of $$N$$ turn of $$L$$ length. Directions of magnetic field lines are: $$ \ $$<img  src="https://cmds-vedantu.s3.ap-southeast-1.amazonaws.com/prod/question-sets/8e644940-8b8b-4e72-a41b-047dc9da417b4386081592702902120.png"/>

Accepted Answer

From left to right

Answer

Right to left

Answer

No field lines

Answer

Cannot say

Question 3

A conducting coil rotating around an axis perpendicular to the centre. It is surrounded by a magnetic field. The direction of induced current will be $$ \ $$ <img  src="https://cmds-vedantu.s3.ap-southeast-1.amazonaws.com/prod/question-sets/baa2f9bd-3d0d-46d0-887d-1323dd80bc386143802375851128884.png"/>

Accepted Answer

No current induced

Answer

Anti-clockwise

Answer

Clockwise

Answer

Current induced for fraction of time

Question 4

The velocity of a rod moving in a magnetic field $$B=2\hat{k}$$ Tesla is $$	ext{50 m/s}$$. If a resistance $$R$$ is connected across the rod, then find the total heat dissipated across the resistor till the rod stops moving. The mass of rod is $$	ext{10 kg}$$, the length is $$	ext{1 m}$$. $$ \ $$<img  src="https://cmds-vedantu.s3.ap-southeast-1.amazonaws.com/prod/question-sets/914a388e-5307-4b35-b185-1e696ded4af13887211002630209729.png"/>

Accepted Answer

$$12500	ext{ J}$$

Answer

Cannot say as given data is insufficient

Answer

$$10000	ext{ J}$$

Answer

None of these

Question 5

If $${{\phi }_{B}}=2t+\dfrac{3}{\pi }\sin \left( \dfrac{\pi }{3}t \right)$$ where $$t$$ is time then magnitude of emf induced at $$t=1\sec $$ is

Accepted Answer

$$2.5$$volt

Answer

$$105$$ volt

Answer

$$\dfrac{2+\sqrt{3}}{2}$$volt

Answer

$$\dfrac{2-\sqrt{3}}{2}$$volt