Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

Two point charges + Q and + q are separated by a certain distance. If + Q > + q then in between the charges the electric field is zero at a point.

Fusion reaction is also known as ..........:

 When is the conduction current the same as the displacement current?

64 drops each having the capacity C and potential V are combined to form a big drop. If the charge on the small drop is q, then the charge on the big drop will be

(a) 2q

(b) 4q

(c) 16q

(d) 64q

In a moving cell galvanometer, we use a radial magnetic field so that the galvanometer scale is:

A particle with charge q, moving with a momentum p, enters a uniform magnetic field normally. The magnetic field has magnitude B and is confined to a region of width d, where d <  , The particle is deflected by an angle θ in crossing the field

(a) sinθ =

(b) sinθ =

(c) sinθ =

(d) sinθ =

Assertion  :   For cooking in a microwave oven, food is always kept in metal containers.

Reason      : The energy of microwave is easily transferred to the food in metal container.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.

If the capacitors in the previous question are joined in parallel, the capacitance and the breakdown voltage of the combination will be:

The order of the size of nucleus and Bohr radius of an atom respectively are

(a)

(b)

(c)

(d)

In a charged capacitor, the energy resides: