CBSE
Multiple Choice QuestionsA cylinder of radius R and length L is placed in a uniform electric field E parallel to the cylinder axis. The total flux for the surface of the cylinder is given by
2πR2 E
π R2/E
R / E
Zero
In the given figure what will be the coefficient of mutual inductance
The total charge induced in a conducting loop when it is moved in magnetic field depends on
the rate of change of magnetic flux
initial magnetic flux only
the total change in magnetic flux
final magnetic flux only
For MRI, a patient is slowly pushed in a time of 10 s within the coils of the magnet where magnetic field is B = 2.0 T. If the patient's trunk is 0.8 m in circumference, the induced emf around the patient's trunk is
10.18 x 10-2 V
9.66 × 102 V
10.18 × 10-3 V
1.51 × 10-2 V
The self-inductance of a coil having 400 turns is 10 mH. The magnetic flux through the cross-section of the coil corresponding to current 2 mA is
2 × 10-5 Wb
2 × 10-3 Wb
3 × 10-5 Wb
8 × 10-3 Wb
A coil of inductance 8 μH is connected to a capacitor of capacitance 0.02 μF To what wavelength is this circuit tuned?
7.54 × 103 m
4.12 × 102 m
15.90 × 103 m
7.54 × 102 m
Assertion: An emf E is induced in a closed loop when magnetic flux is varied. The induced electric field E is not a conservative field.
Reason: The line integral around the closed loop is non-zero.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
The most suitable metal for making electromagnets and transformer cores is
steel
iron
copper
aluminium
Which of the following is the best method to reduce eddy currents?
Laminating core
Using thick wires
Reducing hysteresis loss
None of these
Two solenoids of equal number of turns having their length and the radii in the same ratio 1:2. The ratio of their self-inductance will be
1:2
2:1
1:1
1:4
