When there is an electric current through a conducting wire along its length, then an electric field must exist
|
(a) Outside the wire but normal to it |
(b) Outside the wire but parallel to it |
|
(c) Inside the wire but parallel to it |
(d) Inside the wire but normal to it |
(c) Inside the wire but parallel to it
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
There is a solid sphere of radius ‘R’ having uniformly distributed charge. What is the relation between electric field ‘E’ (inside the sphere) and radius of sphere ‘R’ is
|
(a) E ∝ |
(b) E ∝ |
(c) E ∝ |
(d) E ∝ |
A nucleus decays by 
emission followed by a gamma emission. If the atomic and mass numbers of the parent nucleus are Z and A respectively, the corresponding numbers for the daughter nucleus are respectively.
|
(a) Z - 1 and A - 1 |
(b) Z + 1 and A |
(c) Z - 1 and A |
(d) Z + 1 and A - 1 |
Which of the following is wrong statement
|
(a) An emf can be induced between the ends of a straight conductor by moving it through a uniform magnetic field |
|
(b) The self induced emf produced by changing current in a coil always tends to decrease the current |
|
(c) Inserting an iron core in a coil increases its coefficient of self induction |
|
(d) According to Lenz's law, the direction of the induced current is such that it opposes the flux change that causes it |
Which of the following statement is correct
|
(a) Both Peltier and Joule effects are reversible |
|
(b) Both Peltier and Joule effects are irreversible |
|
(c) Joule effect is reversible, whereas Peltier effect is irreversible |
|
(d) Joule effect is irreversible, whereas Peltier effect is reversible |
The figure shows a circuit diagram of a ‘Wheatstone Bridge’ to measure the resistance G of the galvanometer. The relation 
will be satisfied only when
|
(a) The galvanometer shows a deflection when switch S is closed |
|
(b) The galvanometer shows a deflection when switch S is open |
|
(c) The galvanometer shows no change in deflection whether S is open or closed |
|
(d) The galvanometer shows no deflection |
When two deuterium nuclei fuse together to form a tritium nuclei, we get a
|
(a) Neutron |
(b) Deutron |
(c) α - particle |
(d) Proton |
Plane figures made of thin wires of resistance R = 50 milli ohm/metre are located in a uniform magnetic field perpendicular into the plane of the figures and which decrease at the rate dB/dt = 0.1 m T/s. Then currents in the inner and outer boundary are. (The inner radius a = 10 cm and outer radius b = 20 cm)
|
(a) 10– 4 A (Clockwise), 2 × 10– 4 A (Clockwise) |
|
(b) 10– 4 A (Anticlockwise), 2 × 10– 4 A (Clockwise) |
|
(c) 2 × 10– 4 A (clockwise), 10– 4 A (Anticlockwise) |
|
(d) 2 × 10– 4 A (Anticlockwise), 10– 4 A (Anticlockwise) |
