Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

A condenser of 2mF capacitance is charged steadily from 0 to 5 Coulomb. Which of the following graphs correctly represents the variation of potential difference across its plates with respect to the charge on the condenser

(a)

(a)

(c)

(d)

The half-life of   is 100μs. The time taken for the radioactivity of a sample of   to decay to 1/16^th of its initial value is

(a) 400 μs

(b) 6.3 μs

(c) 40 μs

(d) 300 μs

How does retarding potential vary with the frequency of light causing photoelectric effect?

Half life of radioactive element depends upon:

A power line lies along the east-west direction and carries a current of 10 ampere. The force per metre due to the earth's magnetic field of   is

(a)

(b)

(c)

(d)

The reactance of a circuit is zero. It is possible that the circuit contains:

1. An inductor and a capacitor.
2. An inductor but no capacitor.
3. A capacitor but no inductor.
4. Neither an inductor nor a capacitor.

Equal charges q are placed at the vertices A and B of an equilateral triangle ABC of side a. The magnitude of electric field at the point C  is

(a)

(b)

(c)

(d)

Find x in the following nuclear reaction.
₁₂​Mg²⁴ + ₂​He⁴ → ₁₄​Si^x + ₀​n¹

To get line spectrum, the substances are excited in their:

Four capacitors are connected as shown in the equivalent capacitance between the points P and Q is

(a) 4 μF

(b)

(c)

(d)