Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

A stream of electrons is projected horizontally to the right. A straight conductor carrying a current is supported parallel to electron stream and above it. If the current in the conductor is from left to right then what will be the effect on electron stream 

(a) The electron stream will be pulled upward

(b) The electron stream will be pulled downward

(c) The electron stream will be retarted

(d) The electron beam will be speeded up towards the right

The current through choke coil increases form zero to 6A in 0.3 seconds and an induced e.m.f. of 30 V is produced. The inductance of the coil of choke is

(a) 5 H

(b) 2.5 H

(c) 1.5 H

(d) 2 H

absorbs an energetic neutron and emits beta particles. The resulting nucleus is

(a)

(b)

(c)

(d)

The variation of magnetic susceptibility (x) with temperature for a diamagnetic substance is best represented by

(a)

(b)

(c)

(d)

The energy required to excite an electron from the ground state of hydrogen atom to the first excited state, is

(a) 1.602

(b) 1.619

(c) 1.632

(d) 1.656

A conductor has 14.4 ×  coulombs positive charge. The conductor has (Charge on electron = 1.6  

(a) 9 electrons in excess	(b) 27 electrons in short
(c) 27 electrons in excess	(d) 9 electrons in short

What is the electric field in the cavity of a hollow charged conductor?

If the focal length of a double convex lens for red light is  its focal length for the violet light is

(a)

(b) Greater than

(c) Less than

(d)

A long horizontal metallic rod with length along the east-west direction is falling under gravity. The potential difference between its two ends will           

(a) Be zero

(b) Be constant

(c) Increase with time

(d) Decrease with time