In a step-up transformer the turns ratio is 1:2. A cell of emf 15V is connected across the primary. The voltage across secondary is
Correct answer: C. Zero
- A. 3.0V
- B. 0.7V
- C. Zero
- D. 1.5V
Explanation
The transformer does not work for DC. It works only for AC so option C is correct
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Electromagnetism
Magnetic flux density and magnetic flux describe the strength of a magnetic field and the field passing through a surface. A charged particle moving through a magnetic field experiences a force perpendicular to its velocity and may follow circular or helical motion, depending on the angle between velocity and field.
Practise Electromagnetism
1,176 free Electromagnetism MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Electromagnetism questions
A copper ring having a cut such as not to from a complete loop is held horizontally and a bar magnet is dropped through the ring with its length along the axis of the ring. The acceleration of the falling magnet is :
Primary secondary coils of a transformer have 50 and 200 turns respectively. when primary is connected to 9 volt battery secondary voltage is:
To improve efficiency of transformer the flux coupling b/w primary & secondary coil should be
A conducting ring is placed around the core of an electromagnet as shown in the figure. When key K is pressed , the ring :
when a magnet is moved into the coil of wire shown, there is a small reading on the sensitive meter. Which change would increase the size of the reading?
The rod of unit length 1m is moving at through a magnetic field of IT. If velocity of rod is I ms-1, then induced emf in the rod will be given by: