Electromagnetic induction Quiz 1

Question 1

A coil having N= 100 turns and area $$100c{{m}^{2}}$$ is rotated in a magnetic field $$4Wb{{m}^{-2}}$$. Coil rotates from an angle $${{60}^{\circ }}$$ with the field to perpendicular to the field in 0.6 sec. The emf induced in the coil will be-

Accepted Answer

0.9V

Answer

0.5V

Answer

1.2V

Answer

1.5V

Question 2

If a conducting rod of resistance R and length L is moving in a magnetic field B with a velocity V. The induced emf produces a power P from it. If length of rod is doubled, velocity is reduced by 1/4th  than new power generated will be-

Accepted Answer

$$\dfrac{P}{4}$$

Answer

2P

Answer

$$\dfrac{P}{2}$$

Answer

$$\dfrac{P}{16}$$

Question 3

If current flows through conducting wire 1 and 2 present at a distance of L and 4L from a conducting square loop. The direction of induced current and direction of magnetic field in loop will be $$ \ $$ <img  src="https://cmds-vedantu.s3.ap-southeast-1.amazonaws.com/prod/question-sets/7098d830-db1a-49a4-b74f-74bc6fdb69bf8417789915646262354.png"/>

Accepted Answer

Clockwise and into the plane

Answer

Clockwise and outwards

Answer

Anti-clockwise and outwards

Answer

Anti-clockwise and into the plane

Question 4

The rod of length 1 m in a given circuit is moving with a constant velocity of 12m/s towards right in a magnetic field of 2 T into the plane. Find the induced current in a circuit. $$ \ $$ <img  src="https://cmds-vedantu.s3.ap-southeast-1.amazonaws.com/prod/question-sets/f8d4ecdc-f41b-4481-82c7-4d83dc72baed6083183153599007245.png"/>

Accepted Answer

12 A

Answer

10 A

Answer

8 A

Answer

14 A

Question 5

A loop of wire having radius 8 cm is placed in a varying magnetic field region with time. The change in magnetic field with time is shown in figure. Calculate the emf induced between 0-3 sec. $$ \ $$ <img  src="https://cmds-vedantu.s3.ap-southeast-1.amazonaws.com/prod/question-sets/3fea3723-62f0-4697-badc-9b5fd54cb6a77246674679933127879.png"/>

Accepted Answer

$$5.35	imes {{10}^{-3}}V$$

Answer

$$7	imes {{10}^{-3}}V$$

Answer

$$4.5	imes {{10}^{-3}}V$$

Answer

$$3.5	imes {{10}^{-3}}V$$