Q1 of 44 Page 428

A current carrying wire produces:

Whenever current is passed through a conductor it develops magnetic field around it, in case of wire the magnetic field is circular around it and is given by right-hand thumb rule.

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9

The figure shows a long solenoid, a cylindrical coil of a number of turns of insulated copper wire, connected to a battery through an ammeter A and a rheostat Rh.

(i) Which end of the solenoid is an N-pole and which end is an S-pole?



(ii) Draw the magnetic field lines inside the solenoid and indicate their directions. Are magnetic field lines closed?


(iii) How can you increase the strength of the magnetic field inside the solenoid? Give two methods.

 10

(a) What is meant by a magnetic field?

(b) How is the direction of magnetic field at a point determined?


(c) Describe an activity to demonstrate the direction of the magnetic field generated around a current carrying conductor.


(d) What is the direction of magnetic field at the centre of a current carrying circular loop?

 2

By increasing the number of turns 3 times in a toroidal solenoid, the magnetic field:

 3

The induced potential difference produced, in a coil when a magnet is inserted in it doesn’t depend upon: