Test Details

Chap-4

Oct 22, 9:00 PM

30 minutes

Oct 22, 9:30 PM

30.0 marks

MCQ

30 questions

Dharmendra prasad

Given your background, you could offer Prasad Master Classes focusing on preparing students for JEE Mains and NEET examinations. Here's how you might structure your classes: Curriculum Design: Comprehensive coverage of Class 11 and 12 Physics syllabus. Emphasis on topics frequently tested in JEE Mains and NEET. Teaching Methodology: Conceptual understanding with real-life examples. Problem-solving techniques and shortcuts. Regular quizzes and mock tests to track progress. Resource Material:

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Question Text

Question 1 :
Assertion: The magnetic field at the ends of a very long current carrying solenoid is half of that at the centre. Reason: If the solenoid is sufficiently long, the field within it is uniform.

Question 3 :
Best method to increase the sensitivity of the moving coil galvanometer is to decrease

Question 4 :
A cubical region of space is filled with some uniform electric and magnetic fields. An electron enters the cube across one of its faces with velocity v, and a positron enters via opposite face with velocity -v. At this instant.

Question 5 :
A long solenoid is formed by the winding $$20\ turns/cm$$. What will be the current necessary to produce a magnetic field of $$20\ millitesla$$ inside the solenoid? ($$\dfrac { { \mu }_{ 0 } }{ 4\pi } ={ 10 }^{ -7 }tesla\quad -meter/ampere$$)

Question 6 :
Two beams of protons moving parallel in same direction will :

Question 9 :
Which of the following expressions are applicable to the moving coil galvanometer?

Question 11 :
Complete the following sentenceA current carrying solenoid behaves like a $$\underline{          }$$. 

Question 12 :
A rectangular loop carrying a current $$i$$ is placed in a uniform magnetic field $$B$$. The area enclosed by the loop is $$A$$. If there are $$n$$ turns in the loop, the torque acting on the loop is given by

Question 13 :
By inserting a soft iron piece into a solenoid, strength of the magnetic field

Question 15 :
The relation between voltage sensitivity $$\sigma _{v}$$ and the current sensitivity $$\sigma _{i}$$ of a moving coil galvanometer is (Given that $$G$$ is the resistance of the galvanometer)

Question 16 :
Ina moving coil galvanometer, deflection of thecoil is related to the electrical current $$i$$bytherelation

Question 17 :
A circular coil of wire is connected to a battery of negligible internal resistance and has magnetic induction $$B$$ at its centre. If the coil is unwound and rewound to have double the number of turns, and is connected to the same battery, then the magnetic induction at the center is :

Question 19 :
The coil of the moving coil galvanometer is wound over an aluminium frame

Question 21 :
Which of the following statements is correct for the magnetic field inside a long straight solenoid-carrying current?

Question 22 :
A galvanometer of resistance $$50\Omega $$ is connected to a battery of $$3 V$$ along with a resistance of $$2950\Omega $$ in series shown, full-scale deflection of $$30$$ divisions. The additional series resistance required to reduce the deflection to $$20$$ divisions is

Question 23 :
A beam of electrons passes undeflected through mutually perpendicular electric and magnetic fields. It the electric field is switched off, and the same magnetic field is maintained, the electrons move:

Question 24 :
A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of the magnetic field is

Question 25 :
An 8 cm long wire carrying a current of 10 A is placed inside a solenoid perpendicular to its axis. If the magnetic field inside the solenoid is 0.3 T, then magnetic force on the wire is

Question 26 :
A galvanometer in series with a high resistance is called

Question 28 :
A device used for detecting small currents due to changing magnetic field is known as:

Question 29 :
In a current-carrying solenoid, the magnetic field direction is given by the right hand rule such that the

Question 30 :
We have a galvanometer of resistance 25$$\Omega$$. It is shunted by a 2.5$$\Omega$$ wire, the part of total current that flows through the galvanometer is given as:

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