# Magnetic Effect Of Electric Current Class 12 Important Questions

The Magnetic Effect Of Electric Current Class 12 Important Questions are as follows:

01. Name the following: Cyclotron is also called as _____________

02. Name the following: It is made by connecting a high resistance in series with the galvanometer

03. In pivoted coil type MCG, the coil is pivoted between ___________ pole pieces of the magnet with the help of two springs. The springs are useful to restore the coil to its original position, when current is zero.

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04. Resistance of voltmeter is ________ than galvanometer resistance

05. Which of the two types of Galvanometers (Suspended Type and Pivoted Type) is more Sensitive?

06. True or False: Resistance of an ideal ammeter is Infinite

07. __________ is an instrument used for measuring electric current in a circuit.
(a) Potentiometer
(b) Galvanometer
(c) Ammeter
(d) Voltmeter

08. Resistance of ammeter is ________ than galvanometer resistance

09. Which of the two types of Galvanometers (Suspended Type and Pivoted Type) is Portable?

10. ________ is a circular accelerator with low voltage source for producing high energy particles.

11. Name the Law: The line integral of the magnetic field around any closed path (amperian loop) is equal to the absolute permeability (µ0) times the total current enclosed by the path.

12. True or False: Effective resistance of voltmeter is Sum of Galvanometer and Shunt Resistance

13. Voltmeter is connected in _____ with the circuit to measure voltage across two points

14. For which of the two types of Galvanometers (Suspended Type and Pivoted Type), deflection is measured by plane mirror using lamp & scale arrangement?

15. True or False: Resistance of an ideal voltmeter is infinite.

16. A toroid is a ring shaped closed _______

17. True or False: Suspended Type is less costly as compared to Pivoted type.

18. True or False: The magnetic field inside a solenoid is Zero

19. Whenever a current carrying coil is suspended freely in a radial magnetic field then it will experience maximum torque which will try to deflect the coil. The deflection of the coil is ________ to the current flowing through the coil.

20. The magnetic field produce by a solenoid is similar to the field due to ____________

21. True or False: Torque (τ) acting on a coil in magnetic field is τ = nIBA sinθ

22. A coil of insulated wire wound around an insulating hollow cylinder in which the diameter of the coil is smaller than its length is called ________

23. Name the following: It is made by connecting a low resistance (Shunt) in parallel with the galvanometer.

24. In an Ammeter, by selecting suitable low shunt resistance, the _______ of measurement of current can be increased

25. The galvanometer is said to be ________ if it has no errors i.e. _____ increases if errors decreases.

26. Cyclotron is used to ________ charged particles, which are then bombarded onto heavy atoms to study particle physics and undiscovered sub-atomic particles

27. ________ is an instrument used to measure potential difference between any two points in a circuit.
(a) Potentiometer
(b) Galvanometer
(c) Ammeter
(d) Voltmeter

28. The Magnetic Field outside solenoid is ________

29. ___________ of a Moving Coil Galvanometer (MCG) is defined as the ratio of change of deflection (dΘ) to the change in current (dI) passing through it.

30. Which of the two types of Galvanometers (Suspended Type and Pivoted Type) is more Accurate?

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## Answers: Magnetic Effect Of Electric Current Class 12 Important Questions

01. Magnetic Resonance Accelerator
02. Voltmeter
03. cylindrically concave
04. Greater
05. Suspended Type Galvanometer
06. False {Resistance is zero}
07. (c) Ammeter
08. less
09. Pivoted Type Galvanometer
10. Cyclotron
11. Ampere’s Circuital Law (Ampere’s Theorem)
12. False {It is is Sum of Galvanometer and Series Resistance}
13. Parallel
14. Suspended Type Galvanometer
15. True
16. solenoid
17. False
18. False {No, it is uniform and parallel to axis}
19. directly proportional
20. magnetic dipole
21. False {No, it is τ = nIBA cosθ}
22. Solenoid
23. Ammeter
24. range
25. accurate, accuracy
26. accelerate
27. (d) Voltmeter
28. Zero
29. Sensitivity
30. Suspended Type Galvanometer