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Magnetic effect of current

Magnetic effect of current

Assessment

Presentation

Physics

12th Grade

Practice Problem

Easy

Created by

Seema K

Used 11+ times

FREE Resource

9 Slides • 13 Questions

1

Magnetic effect of current

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2

Open Ended

A charge is placed at rest at a point P whose coordinates are (2,3,0) and a magnetic field B = 5 x 10-3 k is present there. What is the magnetic force experienced by the charge?

3

zero

charge particle at rest

4

Open Ended

An electron enters a given region moving with an initial velocity v = 12.5i m/s where a uniform magnetic field B= B0j is also applied. What is the direction of force experienced by electron due to the magnetic field?

5

Open Ended

Under what conditions does a moving charge experience minimum force due to a magnetic field present there?

6

no or minimum force

when v is either parallel or antiparallel to B

7

Open Ended

Under what conditions does a moving charge experience maximum force due to a magnetic field present there?

8

Open Ended

Why do we use a radial magnetic field?

9

torque= NIABsin θ\theta   

radial makes angles always 90 degree so max torque

10

Open Ended

There is a moving coil galvanometer in which there are 30 divisions on either side of central zero mark. It gives full scale deflection for a current of 600μA. What is its current sensitivity?

11

Is= Ø/I

=30/600 x 10-6 = 5 x 104 div/A

12

Open Ended

If you want to measure a current ranging 0-1.5A using galvanometer. What shunt resistance should be joined with it? Resistance of the galvanometer coil is 300Ω.

13

300x 600 x 10-6/(1.5-(600 x 10-6))=

0.12ohm

14

Open Ended

What is the net resistance of the shunted galvanometer?

15

net resistance= rsRG/( rs + RG)

0.12 x 300/ (0.12 +300)= 0.12ohm

16

Multiple Choice

Assertion-An ammeter is connected in series of the current carrying circuit but a voltmeter is connected in parallel across those two points, pd between which is to be measured.

Reason- Resistance of an ideal ammeter is zero but the resistance of an ideal voltmeter is infinite.

1

a)If both assertion and reason true and reason is correct explanation of assertion.

2

b)If both assertion and reason true but the reason is not the correct explanation of assertion.

3

c)If assertion is true but reason is false

4

d)If the assertion is false but reason is true.

17

Multiple Choice

Assertion- If a proton and an alpha particle enter a uniform magnetic field normally with the same velocity, the time period of revolution of the alpha particle is double than that of the proton.


Reason- In a magnetic field the time period of revolution of a charged particle is directly proportional to its mass.

1

a)If both assertion and reason true and reason is correct explanation of assertion.

2

b)If both assertion and reason true but reason is not correct explanation of assertion.

3

c) If assertion is true but reason is false

4

d)If assertion is false but reason is true

18

Open Ended

Calculate the force per unit length on a long straight wire carrying current of 4A due to a parallel wire carrying 6A current. Distance between the wires is 3cm.

19

Force/length= μ0 2 I1 I2/4πd

1.6 x 10-4 T

20

Multiple Choice

A proton (or an electron) is moving in a uniform magnetic field. What is the path of the proton (or an electron) if it enters parallel to the field.

1

circular

2

straight line

3

helix

21

Multiple Choice

A square coil of side 10cm has 20 turns and carries a current of 12 A. The coil is suspended vertically. The normal to the plane of the coil makes an angle of 300 with the direction of a uniform horizontal magnetic field. If the torque experienced by the coil equals 0.96Nm, find the magnitude of the magnetic field.

1

0.6T

2

0.7T

3

0.8T

22

torque= NIABsinΦ

B= 0.8T

Magnetic effect of current

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