HSC Science (Computer Science) १२ वीं कक्षा - Maharashtra State Board Important Questions for Physics

Explain the phenomenon of self induction

Draw a neat labelled diagram of a parallel plate capacitor completely filled with dielectric.

Electrostatic energy of 3·5 x 10^-4 J is stored in a capacitor at 700 V. What is the charge on the capacitor?

A metal rod `1/sqrtpi `m long rotates about one of its ends perpendicular to a plane whose magnetic induction is 4 x 10^-3 T. Calculate the number of revolutions made by the rod per second if the e.m.f. induced between the ends of the rod is 16 mV.

A network of four capacitors of 6 μF each is connected to a 240 V supply. Determine the charge on each capacitor.

Intensity of electric field at a point close to and outside a charged conducting cylinder is proportional to ______. (r is the distance of a point from the axis of cylinder)

(A) `1/r`

(B) `1/r^2`

(C) `1/r^3`

(D) r³

The magnetic flux through a loop is varying according to a relation `phi = 6t^2 + 7t + 1` where `phi` is in milliweber and t is in second. What is the e.m.f. induced in the loop at t = 2 second?

Explain self induction and mutual induction

A cube of marble having each side 1 cm is kept in an electric field of intensity 300 V/m. Determine the energy contained in the cube of dielectric constant 8. [Given : ∈₀ = 8.85  10^–12 C^2/Nm^2]

Obtain an expression for electric field intensity at a point outside uniformly charged thin plane sheet.

Derive an expression for e.m.f. and current in terms of turns ratio

Prove theoretically  (electromagnetic induction) `e = (dphi)/(dt)`

With the help of a neat diagram, describe the construction and working of van de Graff generator.

The energy density at a point in a medium of dielectric constant 6 is 26.55 × 10⁶ J/m³. Calculate electric field intensity at that point. (ε₀ = 8.85 × 10⁻¹² SI units).

If ‘R’ is the radius of dees and ‘B’ be the magnetic field of induction in which positive charges (q) of mass (m) escape from the cyclotron, then its maximum speed (vmax) is _______.

A) `(qR)/(Bm)`

B)`(qm)/(Br)`

C) `(qBR)/m`

D) `m/(qBR)`

A transformer converts 240 V AC to 60 V AC. The secondary has 75 turns. The number of turns in primary are _______.

(A) 600

(B) 500

(C) 400

(D) 300

Define coefficient of mutual induction. 

Explain the phenomenon of mutual induction.

Write the SI unit and dimention of of co-efficient of self induction

Define the capacitance of a capacitor and its SI unit.