Indian School Al Wadi Alkabir

INDIAN SCHOOL AL WADI ALKABIR

DEPARTMENT OF SCIENCE 2017 – 2018

CLASS: X PHYSICS DATE: 17.01.18

WS. NO. 4 TOPIC: MAGNETIC EFFECTS OF ELECTRIC CURRENT

Very short questions – 1 mark

1. Identify the region where the magnetic field around a current carrying solenoid is maximum? (BBQ)

2. What is the shape of magnetic field lines around a straight current carrying conductor?

3. Name the rule used to find the direction of force on a straight current carrying conductor.(B.B.Q)

Name the rule used to find the direction of induced current.

4. Why ac is used for long distance transmission of electric current? (BBQ)

5. What are magnetic and non-magnetic substances? Give examples for each.

7. What is a Galvanometer?

8) Diagrammatically represent uniform magnetic field in a region.

9. Why fuse wire is made of tin-lead alloy and not copper?

10 . Name some devices in which electric motors are used. (B.B.Q)

11. When a current carrying conductor is kept in a magnetic field, state the position when maximum force acts on it. (BBQ)

12. Mention the angle between a current carrying conductor and magnetic field for which the force experienced by tis conductor is largest. (BBQ)

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Short answer type questions- 2 marks

1. Identify the quantities represented by A and B. State the rule represented by the diagram given below.

2. What is meant by electromagnetic induction?

3. What are the factors on which, magnetic field produced by a current carrying solenoid depends?

4. What are the factors on which the strength of induced current depends?

5. What is the principle on which an electric motor works?

6. What is the principle on which a D C generator works?

7. Why is earthing important for electrical appliance? (B.B.Q)

8. How can it be shown that a magnetic field exists around a wire through which a direct current is passing?

9. Give the characteristics of magnetic field lines.

10. PQ is a current carrying conductor producing magnetic field around it. A and B are two points at a distance r1 and r2 from it . If r1> r2, where is the magnetic strength greater and why? (B.B.Q) 2 marks

B A

r2 r1

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Short answer type questions- 3 marks

Identify the poles

2. What is a fuse? State its function. An electric oven of 2KW power is operated in a domestic electric circuit of 220 V that has a current rating of 5A. What result do you expect? Justify your answer. (BBQ)

3.a) Mention the factors on which the direction of force experienced by a current carrying conductor depends on. (B.B.Q, 3 marks)

b) Under what condition is the force experienced by a current carrying conductor placed in a magnetic field maximum.

c) A proton beam is moving along the direction of a magnetic field. What is the force acting on a proton beam?

4 A) State the function of fuse in a circuit. How is it connected in the domestic circuit?

b) What is the importance of live wire in domestic electric circuits?

c) What is the use of earth and neutral wire in domestic circuits? (B.B.Q) 3 marks

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5. What is overloading of an electric circuit? State two conditions that can lead to overloading of a circuit. How can it be prevented?

6. What is an electromagnet? How can we determine north and South Pole of an electromagnet with the help of a magnetized iron bar? (BBQ)

7. Explain whether an alpha particle will experience any force in a magnetic field if

(i) It is placed in the field at rest.

(ii) It moves in the magnetic field parallel to field lines.

(iii) It moves in the magnetic field perpendicular to the field lines. (BBQ)

8. What are magnetic field line? (BBQ)

Justify the following statements

a) Two magnetic field lines never intersect each other.

b) Magnetic field lines are closed curves.

Long Answer type questions – 5 marks

1. Describe an activity to show how a changing magnetic field in one conductor induces a current in another conductor. State the rule to find the direction of induced current in the conductor.(B.B.Q, 5 marks)

A coil of insulated copper wire is connected to a galvanometer. What would you observe if a bar magnet is

(i) Pushed into the coil

(ii) Held stationary inside the coil

(iii) Pushed out of the coil. Give reason for your answer.

2. (a) Give the significance of the following in a domestic circuit (B.B.Q, 5 marks)

(i) Electric meter

(ii) Earthing

(b) List two precautions that should be taken to avoid overloading. Page 4 of 6

3. Consider a circular loop of wire lying in the plane of the paper. Let the current pass through the loop clockwise. With the help of a diagram explain how the direction of the magnetic field can be determined inside and outside the loop. Name the law used to find the direction of magnetic field and state it.

Draw a diagram to represent a uniform magnetic field in a given region. (B.B.Q) 5 marks, HOTS

4. Describe an activity to draw the magnetic field produced around a current carrying conductor. (B.B.Q, 5 marks )

5. Describe an activity to draw a magnetic field line outside a bar magnet and draw the pattern of magnetic field lines in a bar magnet. (5 marks)

(i) The given figure shows a domestic electric circuit. Study this circuit carefully. List any two errors in the circuit and justify your answer. (ii) Give one difference between the wires used in the element of an electric heater and in a fuse. (iii) List two advantages of parallel connection over series connections.

7. (a) What is a solenoid?

(b) Draw the pattern of magnetic field lines around a current carrying solenoid and compare it with that of a bar magnet.

VALUE BASED QUESTIONS

1. One day Suresh connected many household high power appliances having a current rating more than 6 A to a multi plug of 6A rating. When he was about to switch them on, his elder sister urged him to remove the appliance from the single socket.

a) According to you, why she would not advice to connect multi-high powered appliances on a single socket? Page 5 of 6

b) What would have happened, if he switched them on?

c) What is the moral value shown by his sister?

2. Rohit once went to a construction site along with his father. There he saw large cranes lifting heavy iron rods. After sometime, he noticed that all the cranes were lifting a bunch of iron rods and unloading it to other places. He was surprised and then enquired the crane man about it. The crane man explained the use of electricity in lifting the load.

i) Which effect of electricity is used in cranes?

ii) How an electromagnet is formed?

iii) What are the qualities shown by the crane man?

3) Mr.Sharma used to park his car in the basement of his house. One day in the morning, he noticed that his basement is full of knee deep water and its walls were wet. When he entered the basement he experienced a major shock. His father seeing him from outside, rushed to the main switch and switched it off and thus saved his life.

a) Why did Mr. Sharma experience the shock?

b) What precautions should Mr. Sharma take to avoid such incidence in future?

c) Which qualities were shown by Mr. Sharma’s father?

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PREPARED BY ANU ANNIE MATHEWS Page 6 of 6