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# Magnetic Effects of Current Test Online MCQs

 Test Name Magnetic Effects of Current MCQs Test Subject Physics Test Type MCQs Total Question 15 Total Marks 30 Total Time 15 Mints Test Help For Physics Subject Test Prep. B Tech and BDS Test Prep. Medical Test prep. Engineering Test prep. All Admissions Test.

Get information about Magnetic force and its effects on current in Magnetic Effects of Current MCQs Test Online. Attempt all questions to prepare for the engineering colleges & universities and medical colleges & universities admission tests. Magnetic Effects of Current Test Online MCQs being uploaded below.

## Physics

1. A closely wound flat circular coil of 25 turns of wire has diameter of 10 cm which carries current of 4 amperes, the flux density at the center of a coil will be:

Question 1 of 15

2. An electron moving with kinetic energy 6.6 x 10⁻¹⁴ J enters in a magnetic field of 4 x 10⁻³ T at right angles to it. The radius of its circular path will be nearest to:

Question 2 of 15

3. A solenoid is 1.5 m long and its inner diameter is 4.0 cm. it has 3 layers of winding of 1000 turns each and carries a current of 2.0 amperes. The magnetic flux for a cross-section of the solenoid is nearly

Question 3 of 15

4. Electron moves at right angles to a magnetic field of 1.5 x 10-2 tesla with speed of 6 x 10⁷ m/s. If the specific charge of the electron is 1.7 x 10¹¹ C/kg. The radius of circular path will be:

Question 4 of 15

5. Cyclotron is used to accelerate:

Question 5 of 15

6. A circular coil of radius R carries an electric current. The magnetic field due to the coil at a point on the axis of the coil located at a distance r from the center of the coil, such that r > > R, varies as

Question 6 of 15

7. The magnetic moment (μ) of a revolving electron around the nucleus varies with principal quantum number n as:

Question 7 of 15

8. The cyclotron frequency of an electrons gyrating in a magnetic field of 1 T is approximately:

Question 8 of 15

9. The magnetic flux through a circuit carrying a current of 2.0 A is 0.8 Weber. If the current reduces to 1.5 A in 0.1 s, the induced emf be:

Question 9 of 15

10. Two identical conductors of copper and aluminum are placed in an identical electric field. What is the magnitude of induced charge in the aluminum?

Question 10 of 15

11. A 50 turn circular coil has a radius of 3 cm, it is kept in a magnetic field acting normal to the area of the coil. The magnetic field B is increased from 0.10 T in 2 milli second, the average induced emf will be:

Question 11 of 15

12. An electron is travelling along the x-direction. It encounters a magnetic field in the y-direction. Its subsequent motion will be:

Question 12 of 15

13. A conducting ring of radius 1 meter is placed in an uniform magnetic field B of 0.01 teals oscillating with frequency 100 Hz with its plane at right angle to B. what will be the induced electric field?

Question 13 of 15

14. A coil of copper having 1000 turns is placed in a magnetic field (B=4 x 10⁻⁵) perpendicular to its axis. The cross sectional area of eh coil is 0.05 m². If it turns through 180° in 0.01 second, then the e.m.f. induced in the coil will be:

Question 14 of 15

15. The earth’s magnetic field at a given point is 0.5 x 10⁻⁵ Wb m⁻². This field is to be annulled by magnetic induction at the center of a circular conducting loop of radius 5.0 cm. the current required to be flown in the loop is nearly

Question 15 of 15

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