Test Details

Magnetic Effects of Electric Current

Feb 22, 4:00 PM

30 minutes

Feb 22, 4:30 PM

40.0 marks

MCQ

20 questions

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Question Text

Question 1 :
In the right-hand thumb rule, where does the thumb point to?

Question 2 :
A current carrying circular loop of radius R is placed in the x-y plane with centre at the origin. Half of the loop with x > 0 is now bent so that it now lies in the $y-z$ plane.

Question 4 :
A solenoid of $0.4 m$ length with $500$ turns carries a current of $3 A$. A coil of $10$ turns and of radius $0.01 m$ carries a current of $0.4 A$. The torque required to hold the coil with its axis at right angles to that of solenoid in the middle point of it is:

Question 5 :
The magnetic field normal to the plane of a wire of n turns and radius r which carries a current i is measured on the axis of the coil at a small distance h from the centre of the coil. This is smaller than the magnetic field at the centre by the fraction

Question 6 :
A long solenoid has 200 turns per cm and carries a current i.The magnetic field at its centre is $6.28\times 10^{-2}Wb/m^{2}$. Another long solenoid has 100 turns per cm and it carries a current i/3.The value of magnetic field at its centre is:

Question 7 :
Assertion: If the current in a solenoid is reversed in direction while keeping the same magnitude, the magnetic field energy stored in the solenoid decreases. Reason: Magnetic field energy density is proportional to square of current.

Question 8 :
Assertion: A magnetic field exert a force on a moving charge in the same direction as the direction of field itself. Reason: The direction of force is given by Fleming's left hand rule.

Question 9 :
State whether true or false. The earth wire is generally black in colour.

Question 11 :
Two bulbs of 100 W and 40 W are connected in series. The current through the 100 W bulb is 1A. The current through the 40 W bulb will be

Question 12 :
The maximum current which can flow through a fuse withoutmelting it is called its

Question 13 :
An electrical appliance has a rating 100 W, 120 V. The resistance of element of appliance when in use is :

Question 14 :
Two bulbs are rated $60 W, 220 V$ and $240 W,220 V$ respectively. The ratio of their ratio of their resistances is 

Question 16 :
The laws of electromagnetic induction have been used in the construction of a :

Question 17 :
What energy conversion does take place in a generator when it is in use?

Question 18 :
Suggest way/s in an a.c. generator to produce a higher e.m.f.

Question 20 :
The device used for producing electric current is called a :

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