Alternating Current — Physics STD 12 Science — Question

 What is the magnetic field inside a pipe?

In the circuit shown in the figure, the current through

(a) The 3 W resistor is 0.50A	(b) The 3 W resistor is 0.25 A
(c) The 4 W resistor is 0.50A	(d) The 4 W resistor is 0.25 A

A proton, a deuteron and an α particle are accelerated through same potential difference and then they enter in a normal uniform magnetic field, the ratio of their kinetic energies will be:

A uniform magnetic field B is acting from south to north and is of magnitude 1.5 . If a proton having mass  = 1.7   and charge  = 1.6   moves in this field vertically downwards with energy 5 MeV, then the force acting on it will be

(a) 7.4

(b) 7.4

(c) 7.4

(d) 7.4

In an area of constant magnetic field, a charged particle enters in a direction parallel to the direction of magnetic field with its velocity. The speed of particle is:

The square root of the product of inductance and capacitance has the dimension of

(a) Length

(b) Mass

(c) Time

(d) No dimension

The equivalent capacitance of three capacitors of capacitance   and   are connected in parallel is 12 units and product . When the capacitors   and   are connected in parallel, the equivalent capacitance is 6 units. Then the capacitance are

(a) 2, 3, 7

(b) 1.5, 2.5, 8

(c) 1, 5, 6

(d) 4, 2, 6

Black hole is a

(a) Hole in the ozone layer of atmosphere

(b) Hole in earth's centre

(c) Highly dense matter available in the atmosphere

(d) Hole in troposphere

__________ no. of electrons have charge equal to 1 columb.