## Ampere's Law - MCQ-Basic

**Dear Readers,**

Physics is an important subject in preparation for various Competitive exams.
To keep a track of your preparation we have designed a small quiz of 10 **Basic Level**
Questions on **Ampere's Law**. You have 10 minutes to solve the quiz,
click the start timer button in order to start the timer
and then click on submit button at the end to submit the quiz and view your
scores and correct answers.

**Q1. **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

B

**Q2. **A long solenoid has 200 turns per cm and carries a current of 2.5 amp. The magnetic field at its centre is [u_{0} = 4Ï€ x 10^{-7} weber / m^{2}]

6.28 x 10^{-2} weber / m^{2}

**Q3. **A long solenoid of length L has a mean diameter D. it has n layers of windings of N turns each. If it carries a current I, the magnetic
field at its centre will be

Independent of D

**Q4. **If a long hollow copper pipe carries a current, the produced magnetic field will be

Outside the pipe only

**Q5. **In a current carrying long solenoid, the field produced does not depend upon

Radius of the solenoid

**Q6. **A long solenoid has 800 turns per metre length of solenoid. A current of 1.6 A flows through it. The magnetic induction at the end of
the solenoid on its axis is

8 X 10^{-4} Tesla

**Q7. **Mean radius of a toroid is 10 cm and number of turns are 500. If current flowing through it is 0.1 A then value of magnetic induction
(in Tesla) for toroid

10^{-4}

**Q8. **A current of 1/4Ï€ A is flowing through a toroid. It has 1000 number of turn per meter then value of magnetic field (in wb/m^{2}) along its
axis is

10^{-4}

**Q9. **A long copper tube of inner radius R carries a current i, the magnetic field B inside the tube is

Zero

**Q10. **A solenoid 1.5 meter and 4.0 cm in diameter possesses 10 turns/ cm. A current of 5.0 A is flowing through it. Calculate the magnetic
induction (i) Inside and (ii) At one end on the axis of solenoid respectively

2Ï€ X 10^{-3}T , Ï€ X 10^{-3}T