Explanation:
$\text{e}=-\text{L}\frac{\text{di}}{\text{dt}}$
Current flow in the CKt is clock wise direction, due to Mutual Induction current flow in the loop anti clockwise direction. The net force applied on the loop in east direction. So we can say that the ring will move away from the solenoid.
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A 60 watt bulb is hung over the center of a table 4 m × 4 m at a height of 3 m. The ratio of the intensities of illumination at a point on the centre of the edge and on the corner of the table is
|
(a) |
(b) 2 / 1 |
(c) 17 / 13 |
(d) 5 / 4 |
The current from the battery in circuit diagram shown is
|
(a) 1 A |
(b) 2 A |
(c) 1.5 A |
(d) 3 A |
A source voltage of 8V drives the diode in fig. through a current-limiting resistor of 100 ohm. Then the magnitude of the slope load line on the V-I characteristics of the diode is
|
(a) 0.01 |
(b) 100 |
(c) 0.08 |
(d) 12.5 |
In a parallel plate capacitor of capacitance C, a metal sheet is inserted between the plates, parallel to them. If the thickness of the sheet is half of the separation between the plates. The capacitance will be
|
(a) |
(b) |
(c) 4C |
(d) 2C |
The thermo e.m.f. of a thermo-couple is 25μV/℃ at room temperature. A galvanometer of 40 ohm resistance, capable of detecting current as low as 
, is connected with the thermocouple. The smallest temperature difference that can be detected by this system is
|
(a) 20 ℃ |
(b) 16 ℃ |
(c) 12 ℃ |
(d) 8℃ |
Change Q on a capacitor varies with voltage V as shown in the figure, where Q is taken along the X-axis and V along the Y-axis. The area of triangle OAB represents
|
(a) Capacitance |
(b) Capacitive reactance |
|
(c) Magnetic field between the plates |
(d) Energy stored in the capacitor |
Which of the following is constructed on the principle of electromagnetic induction
|
(a) Galvanometer |
(b) Electric motor |
(c) Generator |
(d) Voltmeter |
Which of the following is not a correct statement
|
(a) Resistivity of electrolytes decreases on increasing temperature |
|
(b) Resistance of mercury falls on decreasing its temperature |
|
(c) When joined in series a 40 W bulb glows more than a 60 W bulb |
|
(d) Resistance of 40 W bulb is less than the resistance of 60 W bulb |
