MCQs

1. [2082] A square coil of area [latex]10^{-2}[/latex] m² is placed perpendicular to a uniform magnetic field of intensity [latex]10^3[/latex] T. What is the magnetic flux through the coil?
   a. 100 Weber
   b. 10 Weber
   c. [latex]10^{-3}[/latex] Weber
   d. [latex]10^{-5}[/latex] Weber
2. [2081 GIE ‘B’] A magnet is moved towards a coil through a certain distance slowly in one case and quickly in the second case. The inducted emf is
   a. more in second case
   b. more in first case
   c. equal in both case
   d. zero in either case
3. [2080 GIE A] A long solenoid carrying a current produces a magnetic field ‘B’ along its axis. If the current is doubled and the number of turns per cm is halved, the new value of magnetic field is
   a. B
   b. 2B
   c. [latex]\frac{B}{2}[/latex]
   d. 4B
4. [2080 P] What is the induced emf in a coil if the flux associated with it changes at the rate of 1 Weber per minute?
   a. 1 Volt                         
   b. [latex]\frac{1}{60}[/latex] Volt                    
   c. 60 Volt                   
   d. Zero
5. [2080 R] Self-inductance of a coil varies as
   a.   Reciprocal of number of turns                                   
   b. Resistance of the coil
   c.   Square of number of turns                                         
   d. Magnitude of current flowing
6. [2079 GIE A] A straight conducting rod of length 0.4m is moving perpendicular to magnetic flux density of 0.9 Wb/m² with a speed of 7 m/s. The emf developed in the rod is
   a.   25.4V             
   b. 2.52V                     
   c. 5.24V                     
   d. 1.84V
7. [2079 O] A coil having N-number of turns and cross-section area A carries a current I. The quantity NIA is,
   a. magnetic flux                                     
   b. magnetic field      
   c. magnetic susceptibility                      
   d. magnetic moment

Answers

1.b

2.b

3.a

4.b

5.c

6.b

7.d